The thing in the green chest gets randomized, but every time you enter the cold dungeon you have to face one of the two bosses, the water or ice dragon. for the wind and earth one you just go fishing the entire time but all the enemies are so high level that the bosses are harder then Torax. The other guys your with are good for attacking a decent amount but the healer will only heal the living. I haven't seen the fire one or the latest version yet though. But I do know you need 8 raiders (the people who help you raid the dungeons.