The Waning, was a period of time after the Redemption Crusades, where, due to the exhaustion of the Imperium's military, world after world and system after system fell to Ork invasion, Chaos insurgence, or plain rebellion. Some systems were turned over to Space Marine chapters for direct government.

大衰落，是救赎远征后的一段时间，由于帝国军队的疲惫，一个又一个世界和星系相继落入欧克入侵、混沌叛乱或普通叛乱之手。一些星系被移交给星际战士战团，由其直接管理。