History
When Korvac and Carina joined forces to block off every single interdimensional aperture into Earth's dimension, Mephisto was among the many denizens of a thousand godly and ungodly realms who could not access Earth. Mephisto was likely killed when Korvac wiped out everything in the universe with the Ultimate Nullifier.[1]
Attributes
Powers
Seemingly those of Mephisto of Earth-616.