Inside some of the new dungeons are locks that correspond to the different key types. If you have a key you can walk up to it and unlock it, using up the key. It will either open a treasure or start a fight that you will get drops from. They give some very powerful crown item drops sometimes.
I just got a skeliton key from beating a hard dungen, but I don't know how to use it... I need help please..
well depends on what key you got, there are bronze,stone, and gold skeleton keys. each key is required for certain dungeons for the four dungeons event. there are skeleton locks that are certain colors for certain keys the locks are only found in the four dungeons event dungeons.
The new dungeons (or Darkmoor at least, haven't done the rest) have doors with huge locks that can be opened with the keys, I don't remember if the lock just opens when you go near it or if you get to choose whether you want to open it or not, I saw a video but haven't visited any doors myself. Using a key also consumes it if I remember correctly.
in the dungeon, there are some rooms that can only be opened with a skeleton key,. you can do the dungeon all over again and use it if you like, but that is what it's for. the doors that can be opened only with this key have a pulsing skeleton on the front hope i was a help!!! katie frostflower lvl 50 in dragonspyre