Changes

Forgebreaker began as a project by [[Fulgrim]] to build the perfect weapon for his brother while the Gorgon did the same. 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 (Weapon)|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]].{{Cite Marker EndFn|1a}}

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 once again duelled, but this was to be 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 provided him with the strength to strike down his beloved brother, Ferrus. Fulgrim was hesitant to deliver the killing blow until the [[Daemon]] within the blade twisted his mind into finishing the duel. Ferrus was beheaded and Fulgrim became fully possessed by the daemon within the Blade of Laeran.{{Cite Marker EndFn|1b}}