Born in 982, Gillecomgain was the son of a peasant named Maíl Brigti and lived near Castle Wyvern in 994. Shortly after the Wyvern Massacre, he encountered Angel while she was stealing food from the castle stables. When he confronted her, Angel slashed his face, leaving him permanently scarred, and dismissed him with the words, “That’ll teach you humans.” The attack filled the boy with lasting bitterness, and he vowed vengeance not only against Angel, but against all gargoyles.

Gillecomgain’s hatred led him into the service of Constantine after Constantine became king. By 997, he had risen to become the king’s squire and took part in anti-gargoyle raids, smashing stone gargoyles with a ferocity that deeply impressed Constantine. The scars on Gillecomgain’s face inspired Constantine to adopt a terrifying visage during the Battle of Rathveramoen, an image that would later influence the design of the Hunter’s mask. Gillecomgain fought savagely in the battle and attempted to kill the young Bodhe. During the fighting, his father was killed by fiery arrows conjured by Brother Valmont. Although Valmont was responsible, Gillecomgain blamed Findlaech for his father’s death.

As an adult, Gillecomgain fulfilled his vow by becoming the Hunter and devoting his life to tracking Angel. Though Angel gave him purpose and direction, it was his father’s death that shaped the darkness within him.

He also entered the service of Prince Duncan as a paid assassin and, in 1020, murdered Findlaech at Duncan’s command. In reward, Duncan appointed him High Steward of Moray and later arranged his marriage to Gruoch twelve years afterward.

After Gillecomgain’s marriage, Duncan ordered him to assassinate Macbeth in order to eliminate a threat to the royal succession. Gillecomgain refused, believing that Macbeth’s sudden death would appear too suspicious. Enraged by this defiance, Duncan revealed to Macbeth that Gillecomgain and the Hunter were the same man, ensuring that conflict between them was inevitable.

Macbeth confronted Gillecomgain at Castle Moray on the same night that Angel, guided by the Weird Sisters, arrived in search of the Hunter. During the ensuing battle, Angel learned the truth of Gillecomgain’s identity and ultimately killed him, bringing an end to the life of the Hunter.