Each land's set pieces from its data: the barrow, the standing stones and the bear are the Valley's alone, the Cove keeps its wolves; the Cove's 0.6.0 plan (treasure: one each, each in its own place)

data/worldlets/cove.json

@@ -15,7 +15,7 @@
     {"type": "ocean_edge"}
   ],
   "climate": {"snowline": 42.0},
-  "places": [{"type": "pier", "at": "beach"}],
+  "places": [{"type": "den"}, {"type": "pier", "at": "beach"}],
   "next": [
     {"to": "valley", "by": "tunnel", "where": "sea_cave"},
     {"to": "highlands", "by": "sail", "where": "pier"}