src/main/java/Monster/Shade.java

@@ -86,7 +86,6 @@ public class Shade extends Monster implements CanMove, CanAttack {
             return false;
         }
         position = validDestinations.get(random.nextInt(validDestinations.size()));
-        updateDestinations(position, world);
         return true;
     }
 

src/main/java/Monster/Troll.java

@@ -91,7 +91,6 @@ public class Troll extends Monster implements CanMove, CanAttack {
             return false;
         }
         position = validDestinations.get(random.nextInt(validDestinations.size()));
-        updateDestinations(position, world);
         return true;
     }
 
@@ -116,11 +115,7 @@ public class Troll extends Monster implements CanMove, CanAttack {
         for (MovementPatterns move : MOVES) {
             if (move.cost <= energy) {
                 List<Position> destinations = move.findLegalDestinations(position);
-                for (Position destination : destinations) {
-                    if (tileHasWrongHabitat(destination, world)) {
-                        validDestinations.add(destination);
-                    }
-                }
+                validDestinations.addAll(destinations);
             }
         }
     }