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So i'm doing the dungeon in krokotopia and I have to fight krokkenhaman or whatever his name is and he isn't appearing I can't find him at all but I see his chest so I don't know whats happening
His chest is always there even if you didn't defeat him. The quest arrow will lead you near his chest, but he walks around the dungeon and doesn't stay in one position. You will need to walk around the square area near his chest to find him.
1) Move out of the immediate area and circle around, leave the sliding door chamber and re-enter, etc. He may just need "room" to spawn. Keep your eyes peeled in the two hallways leading up to his chest. He may just be chilling down the hall.
2) Defeat some dorks in the area to trigger new spawning of mobs, which may induce him to spawn where before there were just dorks. (Remember to refresh your health and mana before you actually fight him)
3) Not sure if you are permitted to change realms while inside the instance, but try that. This is an almost surefire way to get a fresh batch of mobs including Krokenkahmen, if he's hiding.