Primarch Leman Russ of the Space Wolves was a staunch opponent of using psychic powers and sorcery in warfare. He considered these tactics dishonourable, favoring strength and bravery. His distaste for sorcery was particularly targeted at the Thousand Sons Legion of Magnus the Red. Based on his experiences in the Great Crusade, Russ advocated strongly for the Imperium to prohibit psychic powers in battle at the Council of Nikaea.