Fixed up data model and a basic placeholder template

styles/sheets/environment.less

@@ -0,0 +1,27 @@
+.daggerheart.sheet.actor.environment {
+    .potential-adversary-container {
+        width: 100%;
+        height: 50px;
+
+        .adversary-placeholder {
+            font-style: italic;
+            text-align: center;
+            opacity: 0.6;
+        }
+
+        .adversaries-container {
+            display: flex;
+            gap: 8px;
+
+            .adversary-container {
+                border: 1px solid var(--color-dark-5);
+                border-radius: 6px;
+                padding: 0 2px;
+                font-weight: bold;
+                cursor: pointer;
+                background-image: url(../assets/parchments/dh-parchment-dark.png);
+                color: var(--color-light-3);
+            }
+        }
+    }
+}

styles/sheets/sheets.less

@@ -1,6 +1,7 @@
 @import './heritage.less';
 @import './class.less';
 @import './adversary.less';
+@import './environment.less';
 
 .daggerheart.sheet {
     .title-container {