Snyder never wrote any stories about the Anti-Monitor.>>113311961>The Anti-Monitor has been a jobber for proving a character is strong so many times>First defeat
The Spectre, Silver Age Superman times three, Supergirl dying to stop him, Doctor Light draining an entire star and shoving it in his face, every last mystic poisoning his power source, frickin' Darkseid cutting loose on him, the original Superman landing the final blow...>Second defeat
Decades later, is attacked by the Guardians of the Universe and has an entire city exploded in his face before Superboy Prime flying through him; even dead, still powerful enough to serve as the power source for the Black Lantern Corps
Nekron, the Lord of the Unliving, sends him back to the Anti-Matter universe rather than fighting him>Third and fourth 'defeat'
Deadman and Firestorm manage to escape him with the help of the White Lantern, possibly the most powerful weapon in the multiverse; he is not injured or impeded, just mildly frustrated
Anything beyond that is New 52 insanity and utterly irrelevant.