To improve your cave or cavern of the main characters of the game, you must gather resources to hunt. To find out what you need to improve zhilischa- cave, you come to this dwelling, and there you will see that you already have what it takes and how to collect, any animal must be killed to remove the skin. When all you do is collect, then you will be asked to improve the cave dwelling. Very often, in order to improve the home-cave require skin of a rare animal. Then you have to hunt for this animal better at night, using a skill "Hunter Sight".