Codex: Chaos Space Marines (2017), p51 — The Cleaved

The Grave Harbinger, first apparition out of the Cordelian Shimmerportal

The Cleaved first appeared during the insurrection of Magma Cordelian. Amongst the fury of an Astra Militarum counterstrike, the rebels conjured reinforcements - not Daemons of the immaterium, but Chaos Space Marines with oil-like blood oozing from the joins in their armour. Though the new arrivals were massively outnumbered, they fought on through mortal wounds to eventually secure the planet for the insurrectionists.