Anti-Monitor

In DC Comics continuity summarized by the supplied sources, the Anti-Monitor originates as the anti-matter counterpart to the Monitor: both emerged when a probe of the Overmonitor split into opposing beings. The Anti-Monitor lay inert following a titanic stalemate with the Monitor and was later reawakened in modern times by Pariah's experiment that revealed the multiverse, initiating the Crisis events in which he attacks positive-matter universes.

Source excerpts provide only relative and descriptive references rather than detailed, consistent physical traits. The Anti-Monitor is presented as a visually distinct cosmic counterpart to the Monitor (at times among figures resembling Monitors and an Anti-Monitor), implying an imposing, non-human cosmic form, but the supplied materials do not detail specific features such as size, color, or anatomy.

Across the cited narratives the Anti-Monitor wields universe-scale destructive power: he can release massive anti-matter waves that destroy positive-matter universes and absorb their energies (Crisis on Infinite Earths). He conquers Qward and the anti-matter universe during his campaigns, rebuilds armies (including the Thunderers and Shadow Demons in Crisis), and recruits or influences powerful beings as heralds (e.g., Superboy-Prime, Cyborg Superman, Parallax, Sinestro in later storylines). He has been believed destroyed and later returns or whose remains are reused in later multiversal devices, and in one storyline siphons the positive matter of New York City to create antimatter waves.