The Black Brethren of Ayreas are a Chaos Space Marine warband of the Black Legion.[1b]
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They were one of the multiple warbands that took part in the Siege of Vraks. When Lord Zhufor of the Skulltakers rose to power during the siege, he attacked by surprise and killed the Black Brethren's Lord and Champions in order to force the other Chaos warbands into submission.[1b]