Made with Oinkerwinkle's Vertex Modifier. In-game textures.
This is the Space Marine Chaplain's staff of office, the Crozius Arcanum (essentially a winged-skull mace). I would recommend using the Orb of Lightning to go with the attachment in-game, since the Crozius is after all, a power weapon.
Keywords:
Dawn of War, Crozius, Chaplain, Space Marine