During the prologue of Xenoblade Chronicles, the Battle of Sword Valley, the Homs were fighting the Mechon to ensure that the Mechon did not reach Bionis. Just as they were about to lose, Dunban saved the day with the Monado, as he fought alongisde Dickson and Mumkhar. Mumkhar deserted the others, planning to collect the Monado at the end of the battle, but he was assumed to be killed by the Mechon. Dickson and Dunban won the fight but Dunban lost the ability to use his right arm.