Edifice Rex

Edifice Rex is an extremely powerful ascended human from Marvel comics who, for reasons completely unknown, was transformed into a colossal cosmic entity with powers on a par with entities such as Eternity itself.

While a comedy-centric antagonist Edifice Rex would prove to be a threat that made many of Marvel's cosmic entities extremely concerned (save for Master Order) due to his insane decision to "clean" the universe via reverting everything back to the way it was prior to the Big Bang, effectively trapping all of reality inside a Cosmic Egg.