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The '''Brothers of Retaliation''' is a [[Chaos Warband]] that was created on the [[Planet of Sorcerers]], a thousand years after the death of [[Horus]], for the sole purpose of avenging the fate the [[Imperium]] inflicted upon the [[Thousand Sons]]; with [[Battle of Prospero|its betrayal]] of the Legion, during the [[Horus Heresy]]. Led by the [[Chaos Lord]] [[Laudren Thalarn]], a member of the Thousand Sons and survivor of the [[Horus Heresy]], the Brothers of Retaliation were originally composed of his loyal followers amongst the Legion, but Thalarn has since drawn many different forces to his banner throughout the milleniamillennia. Now swollen with hundreds of [[Chaos Space Marines]], thousands of [[Cultists]] and the aid of two [[Daemon Princes]], the Brothers of Retaliation strike at the Imperium from the '''Black Cathedral'''; , a vast Fortress located on a [[Crone World]], that serves as the Warband's [[Homeworld]].{{Fn|1}}