Black Legion

The Black Legion is a Traitor Legion of Chaos Space Marines that is the first in infamy, if not in treachery, whose name resounds as a curse throughout the scattered and war-torn realms of Humanity. The Black Legion was once one of the 9 First Founding Legions of Space Marines who turned Traitor to the Imperium during the Horus Heresy in the early 31st Millennium. The Black Legion, at that time still known as the Sons of Horus, became the primary instrument of its primarch, the Warmaster Horus, to overthrow the Emperor of Mankind and seize control of the Imperium in the name of Chaos.