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Forgebreaker was a legendary hammer forged by Fulgrim, Primarch of the Emperor's Children in a contest of smithing skill with his brother, Ferrus Manus of the Iron Hands. In the end, when Fulgrim and Manus had finished their respective weapons, neither could agree on which was the best with the Phoenix claiming that Ferrus' Fireblade was the best and the Gorgon claiming that Fulgrim's Forgebreaker was in fact the greatest. In the end, they each gifted their weapon to each other with Fulgrim receiving Fireblade and Ferrus receiving Forgebreaker; The start of a bond of brotherhood closer than any other two primarchs that lasted until the outbreak of the Horus Heresy.

When the Heresy began, Fulgrim was sent by Horus to use his renowned oratory skills to sway his brother to their cause. However, Ferrus remained loyal to the Emperor and denounced Fulgrim and Horus as traitors. The two brothers duelled and Fireblade was broken by Ferrus and Fulgrim stole Forgebreaker and with it, rendered his brother unconscious. The two primarchs would later meet again on Istvaan V where they duelled again for the last time with Ferrus wielding the reforged Fireblade and Fulgrim wielding Forgebreaker. In the end, Fulgrim was disarmed and in his panic drew the daemonic Blade of Laeran, which provides him with the strength to strike Ferrus down. Fulgrim was hesitant to land the killing blow, until the Daemon within the blade twisted his mind into finishing the duel. Ferrus was beheaded and Fulgrim was fully possessed by the daemon within the Blade of Laeran.

The Fulgrim-Daemon later presented Horus with the head of Ferrus Manus and Forgebreaker as a sign of his loyalty. The hammer was then given to Perturabo of the Iron Warriors by Horus before the assault on Terra as a gift and the signing of a pact between the two.

It is thought that the weapon, possessed at some point by four different Primarchs, was in the hands of Perturabo until it was taken from him, during an assault on a world around the Eye of Terror, by the Morlock captain of the Avernii Clan, thus returning one of the most prized artifacts of the Horus Heresy back to the Iron Hands chapter.^{[Needs Citation]}

Source

• ¹:Fulgrim by Graham McNeill