Malthaeus (Void Man)

Introduced as Void Man, Malthaeus was a recurring antagonist, whose role was heavily modified from original canon during the rewrites.

Introduction and Pre-Retcon Canon
Malthaeus was originally introduced as a formless telepathic entity, whose purpose was to judge the souls of living entities and banish those deemed unworthy of existence to the Abyss, where they would presumably suffer an eternal punishment of some kind. It was unknown how this judgement was done, but the act itself was done by an entity alluded to as "The Judge." who never made an appearance in canon.