Legend speaks of a half penumbra and half human being that if left uncontained my rip apart the barriers between the realm of the shadow creatures and our world.
The grand elders of existence created a peace-keeping team tasked to intervene in various incidents across the endless number of alternate universes to keep the fabric of time and existence intact. They are the Protectors of Existence.
A mysterious costume ball held on October 31st, where vampires sip wine with werewolves, humans dance with imps, and you - for one night - can be whoever you wish to be.