- "All that is good in me, began with you, father."
- ―Darim to his father before leaving Masyaf, 1257.[src]
When Darim was in his early twenties, he traveled with his parents to Mongolia to combat the rise of the Mongol Empire. Among Darim's most noteworthy accomplishments is the assassination of Genghis Khan, the Mongol leader, in August of 1227.
After returning to the Levantine Brotherhood's fortress of Masyaf, his family was exiled to Alamut following a coup d'état by Abbas Sofian. Darim eventually left his father at Alamut and spent several years traveling around Europe, informing warlords of the impending Mongol threat.
Darim was born in Masyaf in 1195, where he was raised by his parents – an obedient but impulsive son in the words of Niccolò Polo. Darim's training in the ways of the Assassins started at an early age, and he would eventually become a fully-trained Assassin and an expert crossbowman.
Assassination of Genghis Khan
By 1217, Genghis Khan's Mongol Empire had began to spread rapidly from the east, and subsequently slowed the expansion of the Assassin Order. This caused Altaïr to believe that Genghis Khan held a Piece of Eden known as the Sword.
Convinced that they had to stop the Mongols, Darim and his parents left Masyaf on a mission to assassinate Khan. His younger brother Sef remained in Masyaf to care for his wife and children, and Altaïr's right-hand man, Malik Al-Sayf, was placed in charge of the Order until their return.
In early 1227 the Assassins reached Mongolia, where they met with one of the local Brothers, Qulan Gal. The Assassins formulated a plan, and Qulan Gal and Altaïr infiltrated Genghis Khan's camp in August of that year. However, Altaïr had lost much of his stealth with age, causing him to be detected and severely injured by a guard. Qulan Gal managed to save his fellow Assassin and helped him escape the camp, following which the Assassins were forced to regroup and formulate a different strategy.
Realizing the threat to his life, Genghis Khan tried to flee on horseback. Qulan Gal, who had been expecting this, proceeded to shoot down the warlord's horse, while Darim shot Khan with his crossbow. After ten years, the group had accomplished what they set out to do, and Darim and his parents finally started their journey home.
Exiled from Masyaf
Later in 1228, Darim and his parents returned to Masyaf, where they were greeted by a former Assassin apprentice named Swami. He claimed that the man who was supposed to greet them, Rauf, had died of fever during their absence. He also explained that Malik had been arrested by the new leader of the Order, Abbas Sofian, for unknown reasons. Swami then told Darim that his brother Sef had retreated with his family to Alamut, at which point Altaïr urged Darim to retrieve his younger brother and return to Masyaf.
Some time after arriving in Alamut, Darim met with his sister-in-law and nieces. He later received a letter from his father which revealed that his brother had been killed, and Darim hurried back to Masyaf.
He met up with his father in Masyaf village, where the two men fought off attacking Assassins and Altaïr informed Darim that his mother had been killed during a confrontation with Abbas. They successfully escaped Masyaf, and Darim and Altaïr left for exile in Alamut.
His sister-in-law and nieces left Alamut and settled in Alexandria when they were unable to bear Altaïr's suffering. A year later, Darim himself was driven away from Alamut by his father's state of depression and his renewed obsession with the Apple of Eden. Darim traveled to France and England to warn of the advancing threat of the Mongol Empire.
In 1247, Darim returned to Masyaf, following his father's return to power as leader of the Order. In 1257, Darim also traveled to Constantinople to invite the Venetian explorers Niccolò and Maffeo Polo to temporarily reside in Masyaf.
At the end of that same year, the Mongols attacked Masyaf. Darim was ordered by Altaïr to leave before the Mongols reached the fortress, and to take Altaïr's remaining books from his library with him.
As he said a final farewell to his father in front of the library doors, Darim realized that the library was in fact a vault, though his father did not reveal what it was supposed to contain. Bearing several of his father's books, Darim left Masyaf for Alexandria to rejoin his brother's widow and her children.
In 2012, Darim was remembered by his modern successors as a key figure of the Brotherhood, notably for having given an Apple of Eden to the first Sultan of the Bahri dynasty, after the Egyptian Brotherhood had already given the Scepter of Aset to the revolted Mamluks whom had created the new dynasty and had began an era of prosperity for Egypt.
- In Assassin's Creed: Revelations, Darim is depicted with an amputated ring finger, despite Altaïr having deemed that tradition no longer necessary. In Assassin's Creed: Memories, however, he is depicted with all ten of his fingers.