The Blood Rangers are a loyalist Space Marines Chapter of unknown origins. The history of the Blood Rangers is a mystery that only the Chapter Masters and Chief Librarians know of. The loss of the chapter's 3rd Company, their Chapter Master, their Chief Librarian, and a Large portion of their knowledge has devastated the Chapter greatly. But their chapter has endowed and now are a Fleet Based Chapter, But they still have not yet fully replenished the Chapter's 3rd Company. Among their most famous campaigns is the 13th Black Crusade.