Forgotten Tales

Okay, I now have a rusty dungeon key, a key and an unknown key. I think I used one in the Knights tower, I can't remember. Where the heck do the other ones come in use?

Unknown key is to open cyclop dangeon(map 3.1 underground, lvl75 requirement).
Whats rusty key u r talking about? Could u post screenshot here?

Sorry, it's just a dungeon key. I've had it from near the start, but can't remember where I got it from our if I've used it.