black legion

The Black Legion is the largest warband of Chaos Space Marines in Warhammer 40k universe. Formed after the defeat of the Sons of Horus in the Horus Heresy and their retreat in the Eye of Terror, the Legion was founded by former Sons of Horus First Captain Abbadon the Despoiler during the feuds among traitor legions known as the Legion Wars. It includes a substantial portion of the former Sons of Horus alongside some Space Marines from other traitor legions. The Black Legion sees itself not as the successor of Horus and his Legion, but as a new army to continue the Long War against the Imperium and succeed where their predecessors failed.
The warriors of the legion wear black power armor, decorated with gold and symbols of the Chaos Undivided they worship.