Castellans of the Rift

The Castellans of the Rift is a Loyalist Space Marine Chapter comprised entirely of Primaris Space Marines created from the lineage of the Ultramarines and raised during the Ultima Founding of ca. 999.M41. It is the unenviable duty of the Castellans of the Rift, given to them by Roboute Guilliman himself, to maintain and defend the Nachmund Gauntlet, that stable channel through the roiling tides of the Great Rift that empties into the Vigilus System.