As Genghis Khan, the revered warrior and founder of Mongolia, continued to grow his tyrannical empire in the east, he caught the attention of the Assassin Brotherhood, specifically that of its Mentor Altaïr Ibn-La'Ahad.
Altaïr suspected the involvement of a Piece of Eden and was unable to restrain himself from investigating. He left the mountain fortress of Masyaf, accompanied by his wife Maria and son Darim, and headed for Mongolia in 1217. After a ten year journey, they partnered with the Mongolian Assassin Qulan Gal and devised a plan to finally eliminate Khan.
After Altaïr failed to infiltrate Khan’s camp unnoticed, he was rescued by Qulan, forcing a change in tactics. As the aging Mentor took a back seat, his son Darim drove Khan out of the camp. As the conqueror attempted to flee on horseback, Qulan, an accomplished archer, shot his mount. As he lay injured, Darim used his crossbow to end Khan's life.