The Crimson Sabres were a Loyalist Space Marine Chapter of an unknown Founding that may have belonged to the mysterious 13th "Dark Founding", which occurred sometime between the 35th and 36th Millennia. Their Chapter's reputation was built on ruthless efficiency and fastidious adherence to the Codex Astartes. Soon enough, signs that things were awry appeared in their Chapter history. These problems culminated with the genocidal war on Umidia. This world proved to be the fulcrum of change for the Crimson Sabres. The fighting there proved so intense that it changed the Chapter, as they found themselves cursed by the Chaos God Khorne, forever haunted by the fell voices of the slain even after the combat had ended. They attempted to cleanse themselves and silence the voices howling in their mi