Original Factions with horribly simple and unimaginative names: The Shadow Thin wisp like enemies who change form and can merge/combine with one another to become a more powerful creature. The Gray The infamous Gray Aliens of Sci-Fi fame. The Platoon Humanoids with fish heads with googly eyes, flamingo wing arms with bear paws for hands, with snake tails for legs. They screech like Howler Lemurs and have tongues like frogs allowing them to pull guardians into melee range like Scorpion from Mortal Kombat. From another game: Necromorphs (Nuff said) Tyranids (Warhammet 40k) Orks (Warhammer 40k) Chaos (Warhammer 40k) Chaos makes The Darkness look like a kindergartner with an inferiority complex.