The Corpus Brethren are a Chaos Space Marine warband.
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Originally known as the Sentinels, they were among the thirty Chapters corrupted during the Abyssal Crusade. During the Crusade, the Sentinels landed on Oliensis, discovering that the entire Daemon World was the form of a morbidly obese man. Ambushed by a force of Noise Marines, they were eventually swallowed up by the planet itself. When they emerged back into reality, they had been corrupted into a cannibalistic Slaaneshi warband known as the Corpus Brethren.