[quote=@FacePunch]
[@LeeRoy] Umbraxis killed hundreds of people and two city level heroes before he was 'defeated.' That would matter in-universe, even if they were NPCs.

Nightmare has successfully defeated multiple player-controlled heroes and continues to allude capture, murdering dozens as he goes.
[/quote]

Elaboration. Nightmare has so far faced off against. STRIKE Forces(when Anderson was not an NPC), Archangel, The Iron Knight, and Icon. None of which have been a defeat for him as his band has only grown larger and bolder over time. It's a build up. Plus he's killed a hell of a lot. lol