“I found her eyes, her skin, her delicate fingers... and at last, her face. Oh, this beautiful face.”
Quentin is a blood mage with considerable knowledge of necromancy who was driven insane by the death of his wife.
Involvement
Quentin is briefly glimpsed in the quest The First Sacrifice. While searching for the missing Ninette de Carrac, Hawke finds a templar by the name of Emeric who is investigating a mystery regarding the disappearance of multiple women throughout the city. Hawke is investigating the Dark Foundry in Lowtown, where Quentin is spotted momentarily before he flees.
3 years later, while following a lead to a nobleman named Gascard DuPuis, it is revealed that Gascard is also searching for the killer because he murdered Gascard's sister.
Upon returning home, Hawke finds that their mother has gone missing. Hawke can ask Gascard to find Leandra using blood magic in Darktown, or head out to Lowtown to search for her with Gamlen by finding out from a young urchin boy that a wounded man asked her for help and she went away with him. Following a trail of blood, Hawke is led back to the foundry and a hidden entrance to an underground lair that contains multiple female corpses. Eventually, Quentin is finally found with Leandra.
Driven insane by the death of his wife, Quentin had kidnapped and murdered different women in order to take parts of them and rebuild the likeness of his beloved. He saw his beloved's face in Leandra and that is what lead him to kidnap her. Finding his/her mother near death, Hawke kills Quentin and the undead, Abominations, and Shades he summoned; including several desire demons which had possessed Quentin's victims.
If Hawke takes Gascard with him/her to find Quentin, it is revealed that Gascard is actually Quentin's pupil looking for the secrets of necromancy, and the story of his sister is a lie. Quentin originally promised to teach Gascard but had forsaken that promise after being paralyzed by his wife's death. Gascard and Quentin reconcile and Gascard joins Quentin to fight Hawke. However an aggressive Hawke can persuade Gascard to turn on his mentor, while if Varric is in the party, Gascard is automatically killed by him. Quentin and his creatures are killed and Leandra dies in Hawke's arms.
During the search, it is revealed that Quentin had a writing correspondence with someone with the initial "O"[1], which is later surmised to be First Enchanter Orsino. Also, a reply letter from the First Enchanter of the Starkhaven Circle of Magi to Gascard DuPuis might suggest that Quentin might have been one of its escaped mages that fled either after it was burned down.[2]