Krieg Acerbus is a Daemon Prince of Chaos Undivided. He commands the largest warband of Night Lords Astartes in the galaxy.
Prior to the Horus Heresy and before Konrad Curze's death, Acerbus acted as a Captain in the VIII Legion. He seemed to have
a long-term rivalry with Zso Sahaal, the First Company captain. Acerbus claimed that Night Haunter foresaw Sahaal's disappearance
and allowed it to happen, so that his "worthy witterings" would not obscure his vision.