diff --git a/lang/en.json b/lang/en.json
index df7e1485..24f9236b 100755
--- a/lang/en.json
+++ b/lang/en.json
@@ -745,7 +745,13 @@
             },
             "LevelUp": {
                 "AdvanceLevel": "Continue To Level {level}",
-                "TakeLevelUp": "Finish Level Up"
+                "TakeLevelUp": "Finish Level Up",
+                "notifications": {
+                    "info": {
+                        "insufficentAdvancements": "You don't have enough advancements left.",
+                        "insufficientTierAdvancements": "You have no available advancements for this tier."
+                    }
+                }
             },
             "DeathMove": {
                 "Title": "{actor} - Death Move",
diff --git a/module/applications/levelup.mjs b/module/applications/levelup.mjs
index 64a39fb6..c6998523 100644
--- a/module/applications/levelup.mjs
+++ b/module/applications/levelup.mjs
@@ -19,7 +19,7 @@ export default class DhlevelUp extends HandlebarsApplicationMixin(ApplicationV2)
 
     static DEFAULT_OPTIONS = {
         classes: ['daggerheart', 'levelup'],
-        position: { width: 1200, height: 'auto' },
+        position: { width: 1000, height: 'auto' },
         window: {
             resizable: true
         },
@@ -57,31 +57,43 @@ export default class DhlevelUp extends HandlebarsApplicationMixin(ApplicationV2)
             });
         } else {
             const levelSelections = this.levelup.levelSelections;
-            if (levelSelections.total >= this.levelup.maxSelections) {
-                // Notification?
+            if (levelSelections.total + Number(button.dataset.cost) > this.levelup.maxSelections) {
+                ui.notifications.info(
+                    game.i18n.localize('DAGGERHEART.Application.LevelUp.notifications.info.insufficentAdvancements')
+                );
                 this.render();
                 return;
             }
 
-            const tier = this.levelup.tiers[button.dataset.tier];
-            const tierLevels = Object.keys(tier.levels).map(level => Number(level));
-            const lowestLevelChoice = Object.keys(levelSelections.selections).reduce((currentLowest, key) => {
-                const level = Number(key);
-                if (tierLevels.includes(level)) {
-                    if (!currentLowest || level < currentLowest) return level;
-                }
+            const nrTiers = Object.keys(this.levelup.tiers).length;
+            let lowestLevelChoice = null;
+            for (var tierKey = Number(button.dataset.tier); tierKey <= nrTiers + 1; tierKey++) {
+                const tier = this.levelup.tiers[tierKey];
+                lowestLevelChoice = Object.keys(levelSelections.available).reduce((currentLowest, key) => {
+                    const level = Number(key);
+                    if (levelSelections.available[key] >= button.dataset.cost && tier.belongingLevels.includes(level)) {
+                        if (!currentLowest || level < currentLowest) return level;
+                    }
 
-                return currentLowest;
-            }, null);
+                    return currentLowest;
+                }, null);
+
+                if (lowestLevelChoice) break;
+            }
 
             if (!lowestLevelChoice) {
-                // Notification?
+                ui.notifications.info(
+                    game.i18n.localize(
+                        'DAGGERHEART.Application.LevelUp.notifications.info.insufficientTierAdvancements'
+                    )
+                );
                 this.render();
                 return;
             }
 
             await this.levelup.updateSource({
-                [`tiers.${button.dataset.tier}.levels.${lowestLevelChoice}.optionSelections.${button.dataset.option}.${button.dataset.checkboxNr}`]: true
+                [`tiers.${button.dataset.tier}.levels.${lowestLevelChoice}.optionSelections.${button.dataset.option}.${button.dataset.checkboxNr}`]:
+                    { selected: true, minCost: button.dataset.cost }
             });
         }
 
diff --git a/module/applications/sheets/pc.mjs b/module/applications/sheets/pc.mjs
index 466e8b40..63c70e8f 100644
--- a/module/applications/sheets/pc.mjs
+++ b/module/applications/sheets/pc.mjs
@@ -166,13 +166,26 @@ export default class PCSheet extends DaggerheartSheet(ActorSheetV2) {
 
     _attachPartListeners(partId, htmlElement, options) {
         super._attachPartListeners(partId, htmlElement, options);
-        $(htmlElement).find('.attribute-value').on('change', this.attributeChange.bind(this));
-        $(htmlElement).find('.tab-selector').on('click', this.tabSwitch.bind(this));
-        $(htmlElement).find('.level-title.levelup').on('click', this.openLevelUp.bind(this));
-        $(htmlElement).find('.feature-input').on('change', this.onFeatureInputBlur.bind(this));
-        $(htmlElement).find('.experience-description').on('change', this.experienceDescriptionChange.bind(this));
-        $(htmlElement).find('.experience-value').on('change', this.experienceValueChange.bind(this));
-        $(htmlElement).find('[data-item]').on('change', this.itemUpdate.bind(this));
+        htmlElement
+            .querySelectorAll('.attribute-value')
+            .forEach(element => element.addEventListener('change', this.attributeChange.bind(this)));
+        htmlElement
+            .querySelectorAll('.tab-selector')
+            .forEach(element => element.addEventListener('click', this.tabSwitch.bind(this)));
+        htmlElement.querySelector('.level-title.levelup')?.addEventListener('click', this.openLevelUp.bind(this));
+        htmlElement
+            .querySelectorAll('.feature-input')
+            .forEach(element => element.addEventListener('change', this.onFeatureInputBlur.bind(this)));
+        htmlElement
+            .querySelectorAll('.experience-description')
+            .forEach(element => element.addEventListener('change', this.experienceDescriptionChange.bind(this)));
+        htmlElement
+            .querySelectorAll('.experience-value')
+            .forEach(element => element.addEventListener('change', this.experienceValueChange.bind(this)));
+        htmlElement
+            .querySelectorAll('[data-item]')
+            .forEach(element => element.addEventListener.on('change', this.itemUpdate.bind(this)));
+        htmlElement.querySelector('.level-value').addEventListener('change', this.onLevelChange.bind(this));
     }
 
     async _prepareContext(_options) {
@@ -838,6 +851,11 @@ export default class PCSheet extends DaggerheartSheet(ActorSheetV2) {
         await item.update({ [name]: event.currentTarget.value });
     }
 
+    async onLevelChange(event) {
+        await this.document.updateLevel(Number(event.currentTarget.value));
+        this.render();
+    }
+
     static async deleteItem(_, button) {
         const item = await fromUuid($(button).closest('[data-item-id]')[0].dataset.itemId);
         await item.delete();
diff --git a/module/data/levelTier.mjs b/module/data/levelTier.mjs
index 12a6d5ca..7490f7a5 100644
--- a/module/data/levelTier.mjs
+++ b/module/data/levelTier.mjs
@@ -49,7 +49,7 @@ class DhLevelOption extends foundry.abstract.DataModel {
 
         return {
             label: new fields.StringField({ required: true }),
-            checkboxQuantity: new fields.NumberField({ required: true, integer: true, initial: 1 }),
+            checkboxSelections: new fields.NumberField({ required: true, integer: true, initial: 1 }),
             minCost: new fields.NumberField({ required: true, integer: true, initial: 1 }),
             type: new fields.StringField({ required: true, choices: LevelOptionType }),
             value: new fields.NumberField({ integer: true }),
@@ -118,14 +118,14 @@ export const defaultLevelTiers = {
             options: {
                 trait: {
                     label: 'DAGGERHEART.LevelUp.Options.trait',
-                    checkboxQuantity: 3,
+                    checkboxSelections: 3,
                     minCost: 1,
                     type: LevelOptionType.trait.id,
                     amount: 2
                 },
                 hitPoint: {
                     label: 'DAGGERHEART.LevelUp.Options.hitPoint',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.hitPoint.id,
                     value: 1,
@@ -133,14 +133,14 @@ export const defaultLevelTiers = {
                 },
                 stress: {
                     label: 'DAGGERHEART.LevelUp.Options.stress',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.stress.id,
                     value: 1
                 },
                 experience: {
                     label: 'DAGGERHEART.LevelUp.Options.experience',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.experience.id,
                     value: 1,
@@ -148,14 +148,14 @@ export const defaultLevelTiers = {
                 },
                 domainCard: {
                     label: 'DAGGERHEART.LevelUp.Options.domainCard',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.domainCard.id,
                     amount: 1
                 },
                 evasion: {
                     label: 'DAGGERHEART.LevelUp.Options.evasion',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.evasion.id,
                     value: 1
@@ -181,28 +181,28 @@ export const defaultLevelTiers = {
             options: {
                 trait: {
                     label: 'DAGGERHEART.LevelUp.Options.trait',
-                    checkboxQuantity: 3,
+                    checkboxSelections: 3,
                     minCost: 1,
                     type: LevelOptionType.trait.id,
                     amount: 2
                 },
                 hitPoint: {
                     label: 'DAGGERHEART.LevelUp.Options.hitPoint',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.hitPoint.id,
                     value: 1
                 },
                 stress: {
                     label: 'DAGGERHEART.LevelUp.Options.stress',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.stress.id,
                     value: 1
                 },
                 experience: {
                     label: 'DAGGERHEART.LevelUp.Options.experience',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.experience.id,
                     value: 1,
@@ -210,34 +210,34 @@ export const defaultLevelTiers = {
                 },
                 domainCard: {
                     label: 'DAGGERHEART.LevelUp.Options.domainCard',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.domainCard.id,
                     amount: 1
                 },
                 evasion: {
                     label: 'DAGGERHEART.LevelUp.Options.evasion',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.evasion.id,
                     value: 1
                 },
                 subclass: {
                     label: 'DAGGERHEART.LevelUp.Options.subclass',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.subclass.id
                 },
                 proficiency: {
                     label: 'DAGGERHEART.LevelUp.Options.proficiency',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 1,
                     minCost: 2,
                     type: LevelOptionType.proficiency.id,
                     value: 1
                 },
                 multiclass: {
                     label: 'DAGGERHEART.LevelUp.Options.multiclass',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 1,
                     minCost: 2,
                     type: LevelOptionType.multiclass.id
                 }
@@ -262,28 +262,28 @@ export const defaultLevelTiers = {
             options: {
                 trait: {
                     label: 'DAGGERHEART.LevelUp.Options.trait',
-                    checkboxQuantity: 3,
+                    checkboxSelections: 3,
                     minCost: 1,
                     type: LevelOptionType.trait.id,
                     amount: 2
                 },
                 hitPoint: {
                     label: 'DAGGERHEART.LevelUp.Options.hitPoint',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.hitPoint.id,
                     value: 1
                 },
                 stress: {
                     label: 'DAGGERHEART.LevelUp.Options.stress',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 2,
                     minCost: 1,
                     type: LevelOptionType.stress.id,
                     value: 1
                 },
                 experience: {
                     label: 'DAGGERHEART.LevelUp.Options.experience',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.experience.id,
                     value: 1,
@@ -291,34 +291,34 @@ export const defaultLevelTiers = {
                 },
                 domainCard: {
                     label: 'DAGGERHEART.LevelUp.Options.domainCard',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.domainCard.id,
                     amount: 1
                 },
                 evasion: {
                     label: 'DAGGERHEART.LevelUp.Options.evasion',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.evasion.id,
                     value: 1
                 },
                 subclass: {
                     label: 'DAGGERHEART.LevelUp.Options.subclass',
-                    checkboxQuantity: 1,
+                    checkboxSelections: 1,
                     minCost: 1,
                     type: LevelOptionType.subclass.id
                 },
                 proficiency: {
                     label: 'DAGGERHEART.LevelUp.Options.proficiency',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 1,
                     minCost: 2,
                     type: LevelOptionType.proficiency.id,
                     value: 1
                 },
                 multiclass: {
                     label: 'DAGGERHEART.LevelUp.Options.multiclass',
-                    checkboxQuantity: 2,
+                    checkboxSelections: 1,
                     minCost: 2,
                     type: LevelOptionType.multiclass.id
                 }
diff --git a/module/data/levelup.mjs b/module/data/levelup.mjs
index 932bb80c..56e1a516 100644
--- a/module/data/levelup.mjs
+++ b/module/data/levelup.mjs
@@ -1,13 +1,17 @@
+import { chunkify } from '../helpers/utils.mjs';
 import { LevelOptionType } from './levelTier.mjs';
 
 export class DhLevelup extends foundry.abstract.DataModel {
     static initializeData(levelTierData, pcLevelData) {
         const availableChoicesPerLevel = levelTierData.availableChoicesPerLevel;
+        const tierKeys = Object.keys(levelTierData.tiers);
+        const maxLevel = levelTierData.tiers[tierKeys[tierKeys.length - 1]].levels.end;
 
         return {
-            tiers: Object.keys(levelTierData.tiers).reduce((acc, key) => {
+            tiers: tierKeys.reduce((acc, key) => {
                 acc[key] = DhLevelupTier.initializeData(
                     levelTierData.tiers[key],
+                    maxLevel,
                     pcLevelData.selections.filter(x => x.tier === Number(key)),
                     pcLevelData.level.changed
                 );
@@ -39,16 +43,16 @@ export class DhLevelup extends foundry.abstract.DataModel {
         return Object.values(this.tiers).reduce(
             (acc, tier) => {
                 acc.total += tier.selections.total;
-                for (var key in tier.selections.selections) {
-                    const nrSelections = tier.selections.selections[key];
+                for (var key in tier.selections.available) {
+                    const availableSelections = tier.selections.available[key];
 
-                    if (acc.selections[key]) acc.selections[key] += nrSelections;
-                    else acc.selections[key] = nrSelections;
+                    if (acc.available[key]) acc.available[key] += availableSelections;
+                    else acc.available[key] = availableSelections;
                 }
 
                 return acc;
             },
-            { total: 0, selections: {} }
+            { total: 0, available: {} }
         );
     }
 
@@ -77,16 +81,22 @@ export class DhLevelup extends foundry.abstract.DataModel {
 }
 
 class DhLevelupTier extends foundry.abstract.DataModel {
-    static initializeData(levelTier, pcLevelData, pcLevel) {
+    static initializeData(levelTier, levelEndCap, pcLevelData, pcLevel) {
         const levels = {};
-        const levelEndCap = levelTier.levels.end + 1;
-        for (var level = levelTier.levels.start; level < levelEndCap; level++) {
+        for (var level = levelTier.levels.start; level <= levelEndCap; level++) {
             levels[level] = DhLevelupLevel.initializeData(
-                levelTier.availableOptions,
-                pcLevelData.filter(x => x.level === level)
+                level <= Math.min(pcLevel, levelTier.levels.end) ? levelTier.availableOptions : 0,
+                levelTier.options,
+                pcLevelData.filter(x => x.level === level),
+                level < pcLevel
             );
         }
 
+        var belongingLevels = [];
+        for (var i = levelTier.levels.start; i <= levelTier.levels.end; i++) {
+            belongingLevels.push(i);
+        }
+
         return {
             tier: levelTier.tier,
             name: levelTier.name,
@@ -96,6 +106,7 @@ class DhLevelupTier extends foundry.abstract.DataModel {
 
                 return acc;
             }, {}),
+            belongingLevels: belongingLevels,
             levels: levels
         };
     }
@@ -108,19 +119,26 @@ class DhLevelupTier extends foundry.abstract.DataModel {
             name: new fields.StringField({ required: true }),
             active: new fields.BooleanField({ required: true, initial: true }),
             options: new fields.TypedObjectField(new fields.EmbeddedDataField(DhLevelupTierOption)),
+            belongingLevels: new fields.ArrayField(new fields.NumberField({ required: true, integer: true })),
             levels: new fields.TypedObjectField(new fields.EmbeddedDataField(DhLevelupLevel))
         };
     }
 
     get selections() {
-        const allSelections = Object.keys(this.levels).reduce((acc, key) => {
-            acc[key] = this.levels[key].nrSelections;
+        const allSelections = Object.keys(this.levels).reduce(
+            (acc, key) => {
+                const { selections, available } = this.levels[key].nrSelections;
+                if (acc.available[key]) acc.available[key] += available;
+                else acc.available[key] = available;
+                acc.total += selections;
 
-            return acc;
-        }, {});
+                return acc;
+            },
+            { available: {}, total: 0 }
+        );
         return {
-            selections: allSelections,
-            total: Object.values(allSelections).reduce((acc, nr) => acc + nr, 0)
+            available: allSelections.available,
+            total: allSelections.total
         };
     }
 
@@ -128,24 +146,32 @@ class DhLevelupTier extends foundry.abstract.DataModel {
     get tierCheckboxGroups() {
         return Object.keys(this.options).map(optionKey => {
             const option = this.options[optionKey];
+            const checkboxes = [...Array(option.checkboxSelections).keys()].flatMap(checkboxNr => {
+                const levelId = Object.keys(this.levels).find(levelKey => {
+                    const optionSelect = this.levels[levelKey].optionSelections;
+                    return Object.keys(optionSelect)
+                        .filter(key => key === optionKey)
+                        .some(optionKey => optionSelect[optionKey][checkboxNr]?.selected);
+                });
+
+                return [...Array(option.minCost)].map(_ => ({
+                    ...option,
+                    tier: this.tier,
+                    level: levelId,
+                    selected: Boolean(levelId),
+                    optionKey: optionKey,
+                    checkboxNr: checkboxNr,
+                    disabled: !levelId ? false : this.levels[levelId].optionSelections[optionKey][checkboxNr]?.locked,
+                    cost: option.minCost
+                }));
+            });
+
             return {
                 label: game.i18n.localize(option.label),
-                checkboxes: [...Array(option.checkboxQuantity).keys()].map(checkboxNr => {
-                    const levelId = Object.keys(this.levels).find(levelKey => {
-                        const optionSelect = this.levels[levelKey].optionSelections;
-                        return Object.keys(optionSelect)
-                            .filter(key => key === optionKey)
-                            .some(optionKey => optionSelect[optionKey][checkboxNr]);
-                    });
-                    return {
-                        ...option,
-                        tier: this.tier,
-                        level: levelId,
-                        selected: Boolean(levelId),
-                        optionKey: optionKey,
-                        checkboxNr: checkboxNr
-                    };
-                })
+                checkboxGroups: chunkify(checkboxes, option.minCost, chunkedBoxes => ({
+                    multi: option.minCost > 1,
+                    checkboxes: chunkedBoxes
+                }))
             };
         });
     }
@@ -157,7 +183,7 @@ class DhLevelupTierOption extends foundry.abstract.DataModel {
 
         return {
             label: new fields.StringField({ required: true }),
-            checkboxQuantity: new fields.NumberField({ required: true, integer: true }),
+            checkboxSelections: new fields.NumberField({ required: true, integer: true }),
             minCost: new fields.NumberField({ required: true, integer: true }),
             type: new fields.StringField({ required: true, choices: LevelOptionType }),
             value: new fields.NumberField({ integer: true }),
@@ -167,12 +193,15 @@ class DhLevelupTierOption extends foundry.abstract.DataModel {
 }
 
 class DhLevelupLevel extends foundry.abstract.DataModel {
-    static initializeData(maxSelections, levelData) {
+    static initializeData(maxSelections, optionSelections, levelData, locked) {
         return {
             maxSelections: maxSelections,
             optionSelections: levelData.reduce((acc, data) => {
-                if (!acc[data.optionkey]) acc[data.optionKey] = {};
-                acc[data.optionKey][data.checkboxNr] = true;
+                if (!acc[data.optionKey]) acc[data.optionKey] = {};
+                acc[data.optionKey][data.checkboxNr] = {
+                    minCost: optionSelections[data.optionKey].minCost,
+                    locked: locked
+                };
 
                 return acc;
             }, {})
@@ -185,15 +214,30 @@ class DhLevelupLevel extends foundry.abstract.DataModel {
         return {
             maxSelections: new fields.NumberField({ required: true, integer: true }),
             optionSelections: new fields.TypedObjectField(
-                new fields.TypedObjectField(new fields.BooleanField({ required: true, initial: true }))
+                new fields.TypedObjectField(
+                    new fields.SchemaField({
+                        selected: new fields.BooleanField({ required: true, initial: true }),
+                        minCost: new fields.NumberField({ required: true, integer: true }),
+                        locked: new fields.BooleanField({ required: true, initial: false })
+                    })
+                )
             )
         };
     }
 
     get nrSelections() {
-        return Object.keys(this.optionSelections).reduce(
-            (acc, optionKey) => acc + Object.keys(this.optionSelections[optionKey]).length,
-            0
-        );
+        const selections = Object.keys(this.optionSelections).reduce((acc, optionKey) => {
+            const selection = this.optionSelections[optionKey];
+            acc += Object.values(selection)
+                .filter(x => x.selected)
+                .reduce((acc, x) => acc + x.minCost, 0);
+
+            return acc;
+        }, 0);
+
+        return {
+            selections: selections,
+            available: this.maxSelections - selections
+        };
     }
 }
diff --git a/module/data/pc.mjs b/module/data/pc.mjs
index 6ef81f4b..96cbef37 100644
--- a/module/data/pc.mjs
+++ b/module/data/pc.mjs
@@ -1,4 +1,4 @@
-import { getPathValue, getTier } from '../helpers/utils.mjs';
+import { getPathValue } from '../helpers/utils.mjs';
 import { LevelOptionType } from './levelTier.mjs';
 
 const fields = foundry.data.fields;
@@ -349,7 +349,7 @@ export default class DhpPC extends foundry.abstract.TypeDataModel {
         // this.armor.value = this.activeArmor?.baseScore ?? 0;
         // this.damageThresholds = this.computeDamageThresholds();
 
-        // this.applyLevels();
+        this.applyLevels();
         this.applyEffects();
     }
 
@@ -370,97 +370,7 @@ export default class DhpPC extends foundry.abstract.TypeDataModel {
         };
     }
 
-    applyLevels() {
-        let healthBonus = 0,
-            stressBonus = 0,
-            proficiencyBonus = 0,
-            evasionBonus = 0,
-            armorBonus = 0;
-        let experienceBonuses = {};
-        let advancementFirst = null,
-            advancementSecond = null;
-        for (var level in this.levelData.levelups) {
-            var levelData = this.levelData.levelups[level];
-            for (var tier in levelData) {
-                var tierData = levelData[tier];
-                if (tierData) {
-                    healthBonus += Object.keys(tierData.hitPointSlots).length;
-                    stressBonus += Object.keys(tierData.stressSlots).length;
-                    proficiencyBonus += Object.keys(tierData.proficiency).length;
-                    advancementFirst =
-                        Object.keys(tierData.subclass).length > 0 && level >= 5 && level <= 7
-                            ? { ...tierData.subclass[0], tier: getTier(Number.parseInt(level), true) }
-                            : advancementFirst;
-                    advancementSecond =
-                        Object.keys(tierData.subclass).length > 0 && level >= 8 && level <= 10
-                            ? { ...tierData.subclass[0], tier: getTier(Number.parseInt(level), true) }
-                            : advancementSecond;
-
-                    for (var index in Object.keys(tierData.experiences)) {
-                        for (var experienceKey in tierData.experiences[index]) {
-                            var experience = tierData.experiences[index][experienceKey];
-                            experienceBonuses[experience] = experienceBonuses[experience]
-                                ? experienceBonuses[experience] + 1
-                                : 1;
-                        }
-                    }
-
-                    evasionBonus += Object.keys(tierData.armorOrEvasionSlot).filter(
-                        x => tierData.armorOrEvasionSlot[x] === 'evasion'
-                    ).length;
-                    armorBonus += Object.keys(tierData.armorOrEvasionSlot).filter(
-                        x => tierData.armorOrEvasionSlot[x] === 'armor'
-                    ).length;
-                }
-            }
-        }
-
-        this.resources.health.max += healthBonus;
-        this.resources.stress.max += stressBonus;
-        this.proficiency.value += proficiencyBonus;
-        this.evasion += evasionBonus;
-        this.armorMarks = {
-            max: this.armor ? this.armor.system.marks.max + armorBonus : 0,
-            value: this.armor ? this.armor.system.marks.value : 0
-        };
-
-        this.experiences = this.experiences.map(x => ({ ...x, value: x.value + (experienceBonuses[x.id] ?? 0) }));
-
-        const subclassFeatures = this.subclassFeatures;
-        if (advancementFirst) {
-            if (advancementFirst.multiclass) {
-                this.multiclassSubclass.system[`${advancementFirst.feature}Feature`].unlocked = true;
-                this.multiclassSubclass.system[`${advancementFirst.feature}Feature`].tier = advancementFirst.tier;
-                subclassFeatures.multiclassSubclass[advancementFirst.feature].forEach(x => (x.system.disabled = false));
-            } else {
-                this.subclass.system[`${advancementFirst.feature}Feature`].unlocked = true;
-                this.subclass.system[`${advancementFirst.feature}Feature`].tier = advancementFirst.tier;
-                subclassFeatures.subclass[advancementFirst.feature].forEach(x => (x.system.disabled = false));
-            }
-        }
-        if (advancementSecond) {
-            if (advancementSecond.multiclass) {
-                this.multiclassSubclass.system[`${advancementSecond.feature}Feature`].unlocked = true;
-                this.multiclassSubclass.system[`${advancementSecond.feature}Feature`].tier = advancementSecond.tier;
-                subclassFeatures.multiclassSubclass[advancementSecond.feature].forEach(
-                    x => (x.system.disabled = false)
-                );
-            } else {
-                this.subclass.system[`${advancementSecond.feature}Feature`].unlocked = true;
-                this.subclass.system[`${advancementSecond.feature}Feature`].tier = advancementSecond.tier;
-                subclassFeatures.subclass[advancementSecond.feature].forEach(x => (x.system.disabled = false));
-            }
-        }
-
-        //General progression
-        for (var i = 0; i < this.levelData.currentLevel; i++) {
-            const tier = getTier(i + 1);
-            if (tier !== 'tier0') {
-                this.domainData.maxLoadout = Math.min(this.domainData.maxLoadout + 1, 5);
-                this.domainData.maxCards += 1;
-            }
-        }
-    }
+    applyLevels() {}
 
     applyEffects() {
         const effects = this.effects;
@@ -533,6 +443,6 @@ class DhPCLevelData extends foundry.abstract.DataModel {
     }
 
     get canLevelUp() {
-        return this.level.current < this.level.updated;
+        return this.level.current < this.level.changed;
     }
 }
diff --git a/module/documents/actor.mjs b/module/documents/actor.mjs
index d4dc433e..73de0d1f 100644
--- a/module/documents/actor.mjs
+++ b/module/documents/actor.mjs
@@ -18,48 +18,33 @@ export default class DhpActor extends Actor {
     }
 
     async _preUpdate(changed, options, user) {
-        //Level Down
-        if (
-            changed.system?.levelData?.changedLevel &&
-            this.system.levelData.currentLevel > changed.system.levelData.changedLevel
-        ) {
-            changed.system.levelData.currentLevel = changed.system.levelData.changedLevel;
-            changed.system.levelData.levelups = Object.keys(this.system.levelData.levelups).reduce((acc, x) => {
-                if (x > changed.system.levelData.currentLevel) {
-                    acc[`-=${x}`] = null;
-                }
-
-                return acc;
-            }, {});
-
-            changed.system.traits = Object.keys(this.system.traits).reduce((acc, key) => {
-                acc[key] = {
-                    levelMarks: this.system.traits[key].levelMarks.filter(
-                        x => x <= changed.system.levelData.currentLevel
-                    )
-                };
-
-                return acc;
-            }, {});
-
-            changed.system.experiences = this.system.experiences.filter(
-                x => x.level <= changed.system.levelData.currentLevel
-            );
-
-            if (
-                this.system.multiclass &&
-                this.system.multiclass.system.multiclass > changed.system.levelData.changedLevel
-            ) {
-                const multiclassFeatures = this.items.filter(x => x.system.multiclass);
-                for (var feature of multiclassFeatures) {
-                    await feature.delete();
-                }
-            }
-        }
-
         super._preUpdate(changed, options, user);
     }
 
+    async updateLevel(newLevel) {
+        if (this.type !== 'pc' || newLevel === this.system.levelData.level.changed) return;
+
+        if (newLevel > this.system.levelData.level.current) {
+            await this.update({ 'system.levelData.level.changed': newLevel });
+        } else {
+            const newLevelData = {
+                level: {
+                    current: newLevel,
+                    changed: newLevel
+                },
+                selections: Object.keys(this.system.levelData.selections).reduce((acc, key) => {
+                    const level = this.system.levelData.selections[key];
+                    if (level.level <= newLevel) {
+                        acc[key] = level;
+                    }
+
+                    return acc;
+                }, {})
+            };
+            await this.update({ 'system.levelData': newLevelData });
+        }
+    }
+
     async diceRoll(modifier, shiftKey) {
         if (this.type === 'pc') {
             return await this.dualityRoll(modifier, shiftKey);
diff --git a/module/helpers/utils.mjs b/module/helpers/utils.mjs
index 7a58a1f2..20504976 100644
--- a/module/helpers/utils.mjs
+++ b/module/helpers/utils.mjs
@@ -131,3 +131,17 @@ export const setDiceSoNiceForDualityRoll = (rollResult, advantage, disadvantage)
         rollResult.dice[2].options.appearance = diceSoNicePresets.disadvantage;
     }
 };
+
+export const chunkify = (array, chunkSize, mappingFunc) => {
+    var chunkifiedArray = [];
+    for (let i = 0; i < array.length; i += chunkSize) {
+        const chunk = array.slice(i, i + chunkSize);
+        if (mappingFunc) {
+            chunkifiedArray.push(mappingFunc(chunk));
+        } else {
+            chunkifiedArray.push(chunk);
+        }
+    }
+
+    return chunkifiedArray;
+};
diff --git a/styles/daggerheart.css b/styles/daggerheart.css
index 57a1b382..1234b3ad 100755
--- a/styles/daggerheart.css
+++ b/styles/daggerheart.css
@@ -2786,11 +2786,17 @@ div.daggerheart.views.multiclass {
 .theme-light {
   /* Add specifics*/
 }
+.daggerheart.levelup div[data-application-part="form"] {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
 .daggerheart.levelup .tiers-container {
   display: flex;
   gap: 16px;
 }
 .daggerheart.levelup .tiers-container .tier-container {
+  flex: 1;
   display: flex;
   flex-direction: column;
   gap: 8px;
@@ -2809,13 +2815,30 @@ div.daggerheart.views.multiclass {
 }
 .daggerheart.levelup .tiers-container .tier-container .checkbox-group-container {
   display: grid;
-  grid-template-columns: 1fr 2.3fr;
+  grid-template-columns: 1fr 3fr;
   gap: 4px;
 }
 .daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkboxes-container {
   display: flex;
-  gap: 4px;
   justify-content: end;
+  gap: 4px;
+}
+.daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkboxes-container .checkbox-grouping-coontainer {
+  display: flex;
+  height: min-content;
+}
+.daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkboxes-container .checkbox-grouping-coontainer.multi {
+  border: 2px solid grey;
+  padding: 2.4px 2.5px 0;
+  border-radius: 4px;
+  gap: 2px;
+}
+.daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkboxes-container .checkbox-grouping-coontainer.multi .selection-checkbox {
+  margin-left: 0;
+  margin-right: 0;
+}
+.daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkboxes-container .checkbox-grouping-coontainer .selection-checkbox {
+  margin: 0;
 }
 .daggerheart.levelup .tiers-container .tier-container .checkbox-group-container .checkbox-group-label {
   font-size: 14px;
diff --git a/styles/levelup.less b/styles/levelup.less
index 9da3cf21..1e84c270 100644
--- a/styles/levelup.less
+++ b/styles/levelup.less
@@ -3,11 +3,18 @@
 }
 
 .daggerheart.levelup {
+    div[data-application-part='form'] {
+        display: flex;
+        flex-direction: column;
+        gap: 8px;
+    }
+
     .tiers-container {
         display: flex;
         gap: 16px;
 
         .tier-container {
+            flex: 1;
             display: flex;
             flex-direction: column;
             gap: 8px;
@@ -28,16 +35,34 @@
 
             .checkbox-group-container {
                 display: grid;
-                grid-template-columns: 1fr 2.3fr;
+                grid-template-columns: 1fr 3fr;
                 gap: 4px;
 
-                .checkbox-group-container-title {
-                }
-
                 .checkboxes-container {
                     display: flex;
-                    gap: 4px;
                     justify-content: end;
+                    gap: 4px;
+
+                    .checkbox-grouping-coontainer {
+                        display: flex;
+                        height: min-content;
+
+                        &.multi {
+                            border: 2px solid grey;
+                            padding: 2.4px 2.5px 0;
+                            border-radius: 4px;
+                            gap: 2px;
+
+                            .selection-checkbox {
+                                margin-left: 0;
+                                margin-right: 0;
+                            }
+                        }
+
+                        .selection-checkbox {
+                            margin: 0;
+                        }
+                    }
                 }
 
                 .checkbox-group-label {
diff --git a/templates/sheets/pc/pc.hbs b/templates/sheets/pc/pc.hbs
index a2eff2e4..25704b15 100644
--- a/templates/sheets/pc/pc.hbs
+++ b/templates/sheets/pc/pc.hbs
@@ -41,13 +41,13 @@
                                     <button data-action="takeLongRest" title="{{localize "DAGGERHEART.Sheets.PC.LongRest"}}"><i class="fa-solid fa-bed"></i></button>
                                 </div>
                             </div>
-                            <div class="level-container {{#if document.system.canLevelUp}}levelup{{/if}}">
+                            <div class="level-container {{#if document.system.levelData.canLevelUp}}levelup{{/if}}">
                                 <div class="level-value-container">
-                                    <input class="level-value {{#if document.system.levelData.canLevelUp}}levelup{{/if}}" name="system.levelData.level.changed" value="{{document.system.levelData.level.changed}}" type="text" data-dtype="Number" />
+                                    <input class="level-value {{#if document.system.levelData.canLevelUp}}levelup{{/if}}" value="{{document.system.levelData.level.changed}}" type="text" data-dtype="Number" />
                                     {{#if document.system.levelData.canLevelUp}}<div class="levelup-marker">*</div>{{/if}}
                                 </div>
                                 <img src="systems/daggerheart/assets/AttributeShield.svg" />
-                                <div class="level-title {{#if document.system.canLevelUp}}levelup{{/if}}">{{localize "DAGGERHEART.Sheets.PC.Level"}}</div>
+                                <div class="level-title {{#if document.system.levelData.canLevelUp}}levelup{{/if}}">{{localize "DAGGERHEART.Sheets.PC.Level"}}</div>
                             </div>
                         </div>
                         <div class="flexrow">
diff --git a/templates/views/levelup.hbs b/templates/views/levelup.hbs
index 59899409..8caea9f0 100644
--- a/templates/views/levelup.hbs
+++ b/templates/views/levelup.hbs
@@ -7,8 +7,19 @@
                 {{#each tier.tierCheckboxGroups}}
                     <div class="checkbox-group-container">
                         <div class="checkboxes-container">
-                            {{#each this.checkboxes}}
-                                <input type="checkbox" class="selection-checkbox" data-tier="{{this.tier}}" data-level="{{this.level}}" data-option="{{this.optionKey}}" data-checkbox-nr="{{this.checkboxNr}}" {{checked this.selected}} />
+                            {{#each this.checkboxGroups}}
+                                <div class="checkbox-grouping-coontainer {{#if this.multi}}multi{{/if}}">
+                                    {{#each this.checkboxes}}
+                                        <input 
+                                            type="checkbox" class="selection-checkbox{{#if (gt this.cost 1)}} multi{{/if}}" {{checked this.selected}} {{#if this.disabled}}disabled{{/if}}
+                                            data-tier="{{this.tier}}" 
+                                            data-level="{{this.level}}" 
+                                            data-option="{{this.optionKey}}" 
+                                            data-checkbox-nr="{{this.checkboxNr}}" 
+                                            data-cost="{{this.cost}}"
+                                        />
+                                    {{/each}}
+                                </div>
                             {{/each}}
                         </div>
                         <div class="checkbox-group-label">{{this.label}}</div>