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Changes
From Warhammer 40k - Lexicanum
→The Horus Heresy
When the Word Bearers launched their attack against the Ultramarines, the strike against [[Calth]] was led by Lorgar's greatest champion, the former Master of the Faith, Kor Phaeron. He swore to utterly destroy the planet, and was very nearly successful. From his personal battle barge, now renamed ''Infidus Imperator'', Kor Phaeron directed a full-scale invasion of the Calth System. Calth's three sister planets were all destroyed, massive geo-nuclear strikes ripping them apart at the core. Its once gentle sun was laced with deadly metals and substances that increased the star's radiation output tenfold; within a century after the Heresy's end, the final elements of Calth's atmosphere were burned off and the world left airless, its populace forced to live in gigantic underground caverns.
The war on Calth was devastating and horrific. The Ultramarines were shocked by the millions of [[Chaos Cults|cultists]] the Word Bearers used as human shields and disgusted by the hordes of [[daemon]]s they unleashed. The Word Bearers, in turn, had underestimated the tenacity and resolve of their foe. In the end, Lord Kor Phaeron was defeated when reinforcements from [[Macragge]] drove the Word Bearers from the surface of Calth. Kor Phaeron retreated all the way to the [[Maelstrom]], a turbulent region of the galaxy where the Immaterium of Chaos seeps through into the material realm of the universe. Meanwhile, Lorgar led his own [[Shadow Crusade]] in conjunction with the [[World Eaters]], hoping to create a gigantic [[Warp]] storm to cut off [[Ultramar]] from [[Terra]].{{Fn|21}}
Lorgar himself later lead the rest of his Legion against [[Terra]], where he helped smash down the realm of the master he had once served with the fanaticism of a zealot. In the end, [[Horus]] was defeated, and the legions of Chaos were forced to flee. The Word Bearers were also forced to retreat to the [[Eye of Terror]], and there they have remained, returning to the Imperium to raid, pillage, and destroy.