Wendigo are basically zombies. [ More or less. He shifts out of the way so Jotaro can come in based on his permission alone. Being in his room without permission is an offense punishable by death. He wants to go be a lump that doesn't fit on his bed again. ]

They cannot be killed through traditional means. [ HOWEVER... He holds up a finger. ] They have a weakness to silver. [ BUT HE'S NOT DONE. He points riiiight at Jotaro. ]

They are also weak to fire.