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'''Nikaea''' is the planet on which the [[PrimarchsEmperor]] and the [[EmperorPrimarch]] s met during the [[Great Crusade]] to decide the fate of [[psykers]] and sorcery within the [[Imperium]]. Ultimately the use of psykers was heavily allowed but restricted, though some, especially and sorcery completly banned. [[Magnus the Red]] and his legion The [[Thousand Sons]] Legion, continued would continue to study such powers in secret.