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===Arrival on Medusa===

Ferrus was stolen away by the forces of [[Chaos]], just as his brothers were, and spent his first years on the planet [[Medusa]]. As a youth, he discovered an "X" mark on the pod that first brought him to this world and that the chamber was too precise to be a natural formation. Exploring further, he discovered runes and electro-conductive stalagmites all around the chamber. His inspections awakened an imprisoned colossal bio-mechanical worm-like creature, which attacked him and escaped, ignoring his attacks. He followed its path of destruction and swore he would destroy the beast he had unwittingly released. When he reached the surface, he saw other men in the distance but wouldn't reveal himself to them, instead keeping his recent oath in mind.{{Fn|4}} Over time, Ferrus had gained a significant legend to the Clans of Medusa. The storm giants of the Karaashi Pinacle called him ''The Cataclysm''. Due to his unleashing of the wyrm, he was also known as the ''Hunter''. The phantasmagoria dubbed him ''The Finality''. The mecharachnis and phasewraiths that sought him out had seemed to classify him as the ''Rehew Netjer'' or ''Son of Man''. Meanwhile, the Subliminat had called him ''Flesh''.{{Fn|15}}

Years later, Ferrus walked unscathed and fully formed from the mountains where he encountered the roaming clans and tribes of Medusa. Ferrus would not join these tribes, as many of his brothers did. Instead, he sought out physical challenges to make himself stronger and more resilient. These tests ended with his battle against the Great Silver Wyrm [[Asirnoth]], a metallic beast impervious to harm; Ferrus had to drown it in magma to kill it. The melted flesh of the wyrm fused to Ferrus's flesh, giving him the true metal hands his Legion would take its name from. Ferrus returned to the tribes and lectured them on technology. The clans advanced at a stunning pace and Medusa prospered, but Ferrus took care to leave the inter-clan rivalry and fighting by never taking sides, as he saw the competition between them as healthy and good.{{Fn|12}}

The Emperor eventually came to Medusa and Ferrus Manus tested himself on him in a cataclysmic battle that is said to have lain waste to entire mountains. Finally having found someone equal, Ferrus accepted the Emperor as his master and took command of a legion of [[Space Marines]].{{Fn|12}} Ferrus met his brother [[Fulgrim]] early on and initially was disdainful of the Phonecian's appreciation for art and culture, seeing it as a waste of time when a [[Galaxy]] needed to be conquered. Fulgrim jokingly referred to Ferrus as '''The Gorgon''', a reference to the mythical Terran creature whose ugliness turned men to stone. The title ultimately stuck.{{Fn|2b}}

===Great Crusade===

Thousands of planets would fall to the remorseless [[Iron Hands]] under Ferrus's leadership. Each weak link in humanity was to be purged if mankind was to grow stronger. Scholars spoke of the wave of piety and faith that spread before the Iron Hands, with many planets suddenly motivated to look into themselves when they heard that the Iron Hands were approaching{{Cite This}}. During the Great Crusade the Iron Hands battled the [[Human]] [[Diasporex]] alongside the [[Emperor's Children]]. This was symbolic of the bond shared by Ferrus Manus and the Emperor's Children Primarch [[Fulgrim]], who were close friends.{{Fn|2}} However during the [[Conquest of One-Five-Four Four]] he received visions from the [[Eldar]] alluding to his eventual demise at Fulgrim's hands. Distrustful of the Xenos, Ferrus rejected the prophecy.{{Fn|11}}

===Horus Heresy===

Once swayed himself to the side of the Warmaster, [[Fulgrim]] approached Ferrus Manus before the heresy and tried to lure him to join Chaos. Ferrus Manus was so enraged at this proposal that he attacked Fulgrim. A short duel took place, where Ferrus destroyed Fulgrim's sword Fireblade, the same weapon Ferrus had given to him many years before. Fulgrim escaped after rendering Ferrus unconscious, leaving him alive but taking with him the massive [[Thunder Hammer]] ''[[Forgebreaker]]'' he himself had crafted for his brother.{{Fn|2}}

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Later during the Heresy as Horus fell deeper and deeper into Chaos and his mental state perhaps began to deteriorate, he took the skull of Ferrus Manus, mounted it on his throne, and began to increasingly speak to it. During their one-sided conversations, Horus lamented that he only had bloody-handed tyrants, mass murderers, and daemons for his generals instead of strategists and men of duty like Ferrus.{{Fn|9}}