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→Horus Heresy
[[File:Fulgrim Heresy.JPG|thumb|210px|right|Fulgrim during the Horus Heresy.]]
Whilst the exact timing and placement of it varies between versions of the story, it is clear that Fulgrim soon met Horus in person, demanding a personal account of his actions. Instead, Horus was able to sway Fulgrim to his cause. Fulgrim's respect for Horus allowed Chaos to find its way into Fulgrim's heart, destroying Fulgrim's loyalty to Terra, and replacing it with a burning desire to destroy the man who held [[human]]ity back from the perfection Fulgrim desired.{{Fn|1}}{{fn|2i}} Fulgrim was immediately sent to meet with [[Ferrus Manus]], Primarch of the [[Iron Hands]]. Great bonds of friendship and brotherhood existed between them, and Fulgrim felt that he could convince Ferrus of the righteousness of Horus's cause. He was wrong , however, and their meeting did not go well, and concluded concluding in violence. When next the brothers met, it would be as enemies.{{Fn|2j}} Their path chosen, the chaotic rot spread quickly, from Fulgrim to his lieutenants, the Lord Commanders of the [[Space Marine Legion|Legion]], then to company and squad leaders, and finally all but a bare handful of Marines followed Slaanesh rather than the Emperor. Perfection became perfect hedonism. Fulgrim's mental state quickly deteriorated, he began talking to a painting by [[Serena D'Angelus]]{{fn|2h}} and killed the sculptor [[Ostian Delafour]] after he inadvertently slighted the Primarch.{{Fn|2k}}
When the loyalist legions arrived in the Isstvan system, the Emperor's Children were at the forefront of the fighting, aiding in the massacre of their former brethren. During the infamous [[Drop Site Massacre]], Fulgrim and Ferrus Manus met once again, and had their final and fateful duel. Fulgrim wielded the weapon he had made for his brother, the [[Thunder Hammer]] [[Forgebreaker]], while Ferrus did the same with the sword [[Fireblade (Weapon)|Fireblade]]. Though both weapons were shattered Fulgrim proved the victor after taking up his Silver Blade, but discovered he could not bring himself to kill his brother. It was at this point that the [[daemon]] bound within the [[Laeran]] blade fully exerted itself, and Ferrus Manus was struck dead. Fulgrim was shocked into clear-thinking by the death of his brother, aghast at what he had done and at the horrific betrayal and carnage around him. In a further moment of weakness he agreed to the daemon's offer to send him to oblivion and allowed the Warp-creature to escape from the sword. It took but a moment for it to possess him body and soul, trapping his consciousness in a tiny corner of his mind. From that moment on, Fulgrim became a prisoner in his own form, his existence fully controlled by the Slaaneshi daemon. Fulgrim's soul was later trapped in the twisted painting of Serena D'Angelus. The only person aware of the fate of Fulgrim was [[Horus]], who recognized the Daemonic possession almost immediately during their next meeting but considered Fulgrim too valuable an asset to lose.{{Fn|2m}} [[Lorgar]] and [[Magnus]] also became aware of the true nature of Fulgrim upon encountering him.{{Fn|8}}