Five Stages of the Omniverse Level

Donnie and Thanos of the main universe had once been old rivals. Back then, he and Thanos—two beings who belonged to the same race at their origin, one a modern human from Earth and the other an Eternity Titan—had fought each other with the entire main universe as their battlefield. Donnie had killed Thanos five times in a row. At that time, Donnie had still been incredibly weak.