Changes

|Founded =Possibly during the [[Great Crusade]]{{Fn|4b5}}

==OverviewHistory==The Legio Oberon was created during the [[Great Crusade]] on the recently founded Forge World of [[Anvari]] as an attempt by its thrall-master [[Accatran]] to secure their power in the realm of [[Ultramar]]. It was created via donations of a fragment of Titans from the [[Legio Destructor]]. In honor of this agreement, both swore to protect the other. In accordance with Accatran's desire to forge relations with the [[Ultramarines]], the Legio Oberon was often given to the forces of [[Roboute Guilliman]] during the remainder of the Crusade. Their time with the Ultramarines ultimately proved to temper their previously warlike nature while also enhancing the tactical abilities of its [[Princeps]].{{Fn|5}} During the [[Horus Heresy]], the Legion remained loyal to the [[Emperor]] and but suffered little under the [[Word Bearers]] [[Battle of Calth|surprise attack]] at [[Calth]] for little of their strength had arrived by the time the battle began. This became a badge of shame for the Legion, who saw their failure to arrive in time as a violation of their own oaths. Subsequently, they fought alongside the [[Ultramarines]] [[Shadow Crusade|in their battle]] against the [[World Eaters]] and [[Word Bearers]] on [[Nuceria]].{{Fn|1}} They also fought alongside the [[Legio Praesagius]] during the [[Crusade of Iron]].{{Fn|4a}}{{Fn|5}}