It's a Cosmic Keystone
held by the Lord of the Universe which unlocks the door separating the realms of Mortals and Gods. It has three "teeth," one tooth is shaped like the sun, one like the moon, and one like a star (I know the sun is a star, but I'm differentiating for imagery's sake). The key's shape is intentionally Awesome but Impractical
, and I'd like help in naming it and keeping with a sort of "Impossible" theme.