During the Horus Heresy, Leman Russ, the "Wolf King," led the Space Wolves Legion to quell a rebellion on Dulan. Ordered to bring Magnus the Red to Terra for judgement for his violation of the strictures of the Council of Nikaea against the use of sorcery when he violated the psychic wards around the Imperial Palace in an attempt to warn the Emperor of Horus' treachery, Russ was misled by Horus into seeking to Magnus' Thousand Sons Legion. Known for his disdain for psychic powers and sorcery, Russ vanished into the Eye of Terror after the Horus Heresy, following a disturbing vision of unknown origin and content. The primarch appointed Bjorn the Fell-Handed as his successor to lead the Space Wolves Chapter as the first Great Wolf.