The Brotherhood of Darkness are a warband of Chaos Space Marines of unknown origin and allegiance, though they may be related to the Night Lords Traitor Legion, due to their their similar iconography.
- Qabbalis Heresy (Unknown Date.M40) - The Brotherhood of Darkness are known to have taken part in the Qabbalis Heresy.
- Destruction of Convoy 36/129/b (003.998.M41) - A convoy of Imperial vessels including cargo carriers, transport spacecraft and civilian passenger liners was ambushed by warships belonging to the Brotherhood of Darkness Chaos Space Marines in the Pandraxx Sub-sector of the Acteron Sector in the Ultima Segmentum. All spacecraft in the convoy were destroyed and no survivors were found.
The Brotherhood of Darkness wear jet-black Power Armour with red trim on the shoulder guards. The armour is covered in yellow glowing blasphemous glyphs.
The badge of the Brotherhood of Darkness is a bone-coloured, horned skull with crimson bat-like wings on a black background, strikingly similar to that of the Night Lords Traitor Legion.
- Battle Missions (2010), pg. 9
- Codex: Chaos Space Marines (4th Edition), pg. 18