We are Returned!!! Death to the False Emperor!!!

Horus's death broke the Sons of Horus' morale, and they were the first of the Traitor Legions to retreat from Terra, an act that would earn them the hatred of all the other Traitor Legions. The Legion re-grouped on a world inside the Eye of Terror. There they built a fortress-tomb for the safe-keeping of the Warmaster's corpse and even in death still revered him as their commander. Nobody was appointed in his place and the Captains of the Legion would offer sacrifices and pray for guidance in his shrine.

The Sons of Horus were initially the most aggressive Legion against the Imperium, as if to atone for their previous cowardice on Terra. The Sons dedicated themselves not to one single Chaos Power, but constantly shifted their allegiance to whatever god suited them at the time. Marines willingly became possessed by the Chaos gods' daemons; with every change in loyalty, the daemons of the rejected god abandoned the hosts, leaving them lifeless husks. The once great Legion constantly dwindled in number, until they neared extinction. Eventually the desperate experimentation and research by the Legion's Sorcerer-Librarians uncovered a method of possession that did not destroy the mortal host, saving the Legion.

The Traitor Legions, along with the restored but still numerically inferior Sons of Horus, became embroiled in a series of internecine wars triggered by the Emperor's Children, culminating in the destruction of the Sons' fortress. To the disgust of the Sons of Horus, the Warmaster's corpse was taken by the Emperor's Children and several clones were created by Fabius Bile.

At this point Abaddon, Captain of the 1st Company (himself rumoured to be a clone of Horus), took the position of Warmaster. Under him, the Sons rejected Horus's name and painted their armour black. Incidentally, Abaddon's elite elements of the Legion's 1st Company had already worn black armour.

Abaddon led the new "Black Legion" in a lightning raid, destroying the corpse and the clones of the Warmaster. The Legion fled onboard their remaining space barge into further exile. They have raided the Eye of Terror and the Imperium ever since.


Black Legion[blacklegion40k.guildlaunch.com]