Xamar was a male Khil trained as a Jedi by Krynda Draay following the Great Sith War, who later took part in the Padawan Massacre of Taris. After being discovered to be Force-sensitive as a youth, he was taken to the Draay Estate on Coruscant to be trained as a Jedi Consular, along with a group of other talented students. Together, this group's abilities were far greater than the sum of their parts, and their teacher, Krynda Draay, believed they were the group she had prophesied would vanquish the threat of the Sith. After completing their training, Xamar and the others were inducted into the secret, cabalistic Jedi Covenant, and formed the First WatchCircle, though he spent some time serving with both the Republic Fleet and the navy of his homeworld. Early in the Mandalorian Wars, the First WatchCircle took on a group of Padawans on Taris, with Xamar training a Nagai named Gharn.

However, the WatchCircle had a vision of one of the Padawans turning to the dark side and slaying them all, and they decided to kill each of their Padawans to prevent it from happening. Xamar was far more cautious about the massacre than his peers, but ultimately slew Gharn with his lightsaber. One of the Padawans, Zayne Carrick, escaped, and the WatchCircle made him a scapegoat for the murders, but was unable to apprehend him. After Covenant members Raana Tey and Feln had been killed inadvertently by Marn Hierogryph, the WatchCircle's leader, Lucien Draay, assigned Xamar to Republic Admiral Saul Karath's flagship, Courageous, to try to prevent Carrick from reaching Coruscant and exposing the Covenant to the Jedi Order proper. In Xamar's earlier vision, he had been killed by friendly fire while aboard a Republic ship; rather than waiting to meet his fate, he decided to take the initiative and make his own luck. He fled the Republic ship, captured Carrick personally, and presented him to the Jedi Council. Xamar confessed to killing the Padawans and supplied the Council with information on the Covenant. Enacting a plan formulated by Xamar and the Council, the Khil took Carrick to the Draay Estate, pretending to have captured him by force, though things went awry, and his plot was foiled by Krynda's retainer, Haazen. A force of Jedi Knights supplied by the Council arrived, and Xamar clashed blades with a number of Covenant members before fleeing outside. There, he was killed when an overhead Republic ship fired on his position.

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