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Aecus Decimus

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Aecus Decimus was a Chapter Master of the Ultramarines during the Horus Heresy.

Decimus commanded the 17th Chapter of the Legion and was stationed in Ultramar upon the outbreak of the Shadow Crusade. During the Percepton Campaign Decimus led his forces against the Word Bearers but the battle was going poorly.[1a] He was severely wounded, though he continued to fight. Thousands of the enemy fought them, with dreadnoughts and tanks, but then the attack from orbit began to strike. The Ultramarines besides Decimus thought it could be reinforcements, but Decimus was shamed that he did not tell of his final contingency plan. Decimus told his men that the planet was lost, but they would take the traitors with them.[1b]

In their final moments, he rallied his troops, and they were filled with pride and anger as he called for a final charge as death swept the planet. The Ultramarines used Phosphex, a world killing weapon, upon the planet of Percepton Primarus.[1c]

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