Ferrus Manus

Ferrus Manus is the erstwhile Primarch of the Iron Hands Space Marines, a master smith known for creating weapons that were able to inspire awe in any who saw them, such as a blade he created for Fulgrim, Primarch of the Emperors Children, or a Boltgun he created for Vulkan, primarch of the Salamanders, said to have a barrell designed to look like the gaping mouth of a dragon.

His hands were metallic and he needed no hammer or flame to create beauty through metallurgy.

Great Crusade
It was said that there was no closer bond during the great crusade than that between the primarchs than that between Fulgrim and Ferrus Manus, and that which was between their chapters. They often fought side-by-side during the crusade, both styles of combat used by each chapter complimenting eachothers weaknesses. This ended tragically when Fulgrim fell to the poisoned whispers of Chaos and Horus, and failed to talk his brother into open rebellion. The first resulting combat between them left Ferrus Manus unconcious and his battlefleet crippled, however Fulgrim was not able to bring himself to strike down his brother.

Death
Died at the Drop Site Massacre of Istvaan V at the hands of Fulgrim, beheaded with the daemonsword Fulgrim took from the Slaanesh temple on Laeran. His death shocked Fulgrim out of the depths of his betrayal of the Emperor, but his anguish made him ripe for posession at the hands of the very same daemon-tainted sword he picked up during his own battles during the great crusade, essentially ending the existance of Fulgrim as a seperate entity.