The Rift Keepers are a strange and enigmatic Chapter of Space Marines rarely seen in the Galaxy at large. The Chapter is wholly (some would say fanatically) dedicated to guarding a small but highly dangerous Warp Storm known as Badak's Rift, located on the very edge of the Astonomicon in the farthest edges of the Ultima Segmentum. It is a dark and sinister place, named after the fool Rogue Trader that first ventured into it, never to return. Few if any ever venture near that area of empty space, yet the Rift Keepers will defend this dark place to their last with a will that is unlike anything seen, even in Space Marines.