Angels as a race.

I'm not trying to create a faction around a single unit. I'm trying to create a faction around a complete class of units. Why wouldn't that work? There's a demon faction, and it only contains demons, and no units from other factions! Angels need to be introduced, at least to provide a counterbalance.

But it's not the same group of demons – I can't classify Cerberuses or Nightmares as part of the simple demons group. And besides, demons have existed for several installments of the Heroes series, and they probably thought about an angel faction in the same way as everyone else – that angels are enough for the humans.)))