Theresa "Tessa" Gray is a warlock and a scholar.
When Magnus and the Shadowhunters of the New York Institute were trying to find the warlock who made the potion for Jocelyn that put her in a deep slumber, Tessa was included in the final list of warlocks, along with Catarina Loss and Ragnor Fell, whom they suspected were powerful enough to be capable of doing it.
Skills and abilities
- Immortality: As a warlock, Tessa has been granted immortality. Physically Tessa does not age.
- Magic: As a warlock, Tessa has access to magical powers.