They are no longer factions according to the data mined info. Osiris is a experienced player only multiplayer 3v3 that rewards people with "The Fate of all Fools" Scout rifle. Seven Seraphs are unknown, but campaign areas found in glitched areas of the beta were named with Seraphim. I can discuss what I think if you want, given that Seraphim are God protectors/coverers/singers