In the beginning there were “The 6” mortal being who achieved god like power, roaming the multiverse and bringing justice and hope where ever it was needed
Along the way they met up with a terrible force that came to be known as “The Oblivion”
The Oblivion is the consumer of the multiverse. It “consumes” multiple universes simultaneously moving from one far end of a universe to another. Nothing that enters it ever returns. The closer you come to The Oblivion the stronger the gravity becomes pulling you into it, thus those straying to close often find themselves unable to escape and are consumed.