Altair's Chronicles is the Assassin's Creed game designed for the Nintendo DS system. 

Game plot:

It is 1190, during the Third Crusade. Altair, after facing an arduous journey, returns to Aleppo, which, to the surprise of the protagonist, is attacked by a handful of Templars, here Al-Mualim, entrusts Altair with an arduous task: to retrieve the Chalice, a sacred object with great power capable of changing the destiny of those who possess it. Altair will have to fight against the game's main antagonist: Lord Basilisk, the ruthless Master Templar. This struggle will have a sad denouement in which Altair, after eliminating the Templar sect and Lord Basilisk himself, will have the woman also called "the Chalice" (Adha) taken away from him by some surviving Templars.