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Scaevolla was an officer of the Luna Wolves and fought in the Great Crusade for the Imperium. At some point during the Crusade, he developed a close friendship with Captain [[Aleph]] of the [[Imperial Fists]], after Scaevolla rescued Aleph from the [[anak]] of [[Cestus II]] in the [[Battle of Thrael Falls]]. For the remainder of the Crusade, he relished the opportunity for his forces to fight alongside Aleph and the Fists. Together, Scaevolla and Aleph cleansed the [[Haruspex of Crore]] and held the [[monastery of Satrapos]] alone against the [[ork]] horders of [[the Starbiter]]{{Fn|1}}

After Horus was named [[Warmaster]] of the Great Crusade following the [[Ullanor Crusade]], his Legion, including Scaevolla, were renamed the Sons of Horus in his honour. Scaevolla would later follow his [[Primarch]], rejecting the Imperium and embracing [[Chaos]], and he fought with the bulk of his Legion in the subsequent Horus Heresy. Notably, he was amongst the Sons of Horus to fight in the Siege of Terra, being part of the force tasked with landing near the [[Imperial Palace]] and breaching the [[Eternity Gate]]. There he met Aleph once again, for the first last time since the Sons of Horus had turned Traitor. Scaevolla attempted one last time to convince Aleph to join him in the rebellion, but Aleph refused and Scaevolla, enraged at his friend's seeming betrayal, engaged him in a duel. He defeated Aleph but, as the Imperial Fist died, Scaevolla ripped out one of Aleph's [[progenoid glands]] and swore an oath to the [[Gods of Chaos|Four True Gods]] that he would hunt down and kill, not just Aleph, but all of the descendants that were created from Aleph's [[gene-seed]] and build a monument to Chaos from his victims' skulls. Unfortunately for Scaevolla, Aleph, and many others through the years, the Gods were listening and Scaevolla's oath became binding.{{Fn|1}}