Alpha and Omega are identical twins with identical, fluid appearances and personalities. Called the Heads of the Hydra, they are as short as Space Marines. This is the only consistent thing about them, everything else is a lie. Their loyalties are a lie. Their appearances, a lie, a disguise. Their motives, a distraction, yet another lie. Their personalities, a lie that keeps changing. They have no truth except that they are short enough to be Astartes to blend in. This description is also a lie.