killing a troll, makes the troll event come, killing a surtling, picking up a head ... that makes that event come... it says killing lots of wolfs makes the wolf hunt come, on another page it says if you kill bonemass it will come. My self, I killed alot of wolfs not bonemass and the event poped for me, new seed.. killed bonemass.. not wolfs... wolfs came hunting so both will trigger the event to spawn after that