A nice idea I like it,
There was similar version of this in the following story.
http://escapepod.org/2007/09/06/ep122-transcendence-express/
WARNING I AM NOT ADVOCATING THE CONSUMPTION OF THE SHORT STORY IN THE ABOVE LINK.
This could use the 100 word treatment. Because a lot of the information (NOT ALL) given is useless in terms of interacting with the item and the mini world developed for the item lacks personality or wit.
Items (Other) (Magical)
The item deserves a cool history: Who invented such a handy gadget? What did the Locksmiths' Guild do when they heard? What have wizards done to counter it? Once you have a sense of its history, you'll be able to tell what limits the Skeleton Key ought to have.
If it has virtually NO limits, such an item would become a potent magic indeed, the subject of intense interest from those who want locks opened and from those who want locks to remain closed...
"It has been found," hissed the Archlich. "The key to open the Tomb of the Elder God Hlithiss! Fetch it, my minions!" Go to Comment