I can't get to the third part of that lvl 10 - 17 dungeon looking place (forgot name) . It says i need some sort of key , anyone got an idea how i'm supposed to get one ? I apreciate and help given :p

you have to do this one mission first where you go up to the dungeon entrance and kill this lvl 5 boss. then he gives you a key. If you go from the queens gate straight up north, you will find this one city mayor type person and he'll give it to you.