The Inner Key Of Oz

The Inner Key of Oz is a magical key made up of steel from Oz. Not much is known about this key, except that it can only be mended in Oz, if broken, and can unlock a persons soul

Soul Splitting
This key has the ability to split one's soul into two seperate beings; one dark and one light. This is an extraordinary feat, considering that the horseman Death is not even able to do this. It appears that while splitting the souls, it also creates a body manifeston for both of them, which will combine again, she they be reattached. Although they are now seperate, their physical bodies are still connected, and so if one is damaged, so the other one will be as well.