[Astral Claw 126]

Alpha Legion hmm? Well, think the guerilla fighters of the space marines. These guys can be set up any sorts of ways. They use any and all tactics, and also have a huge network of cultists. To reflect their sneakiness in game terms, i would make sure to outfit the Elites as Chosen. Though Termies are also nice, if you are looking to follow more fluff, then the Chosen better represent the Alpha Legion's MO. Also, the Alpha Legion don't really care for demons, BUT will use them if called in by cultists. Finally, and this is a good idea, in IA5 they say you can model them as regular space marine models in Alpha legion colors. that would be a good fluff angle as well!