Kett Gask is a lean human woman in her late twenties whose transformation into a tiefling is still visibly incomplete. Her skin is a muted brick-red across her hands, neck, and the left side of her face, fading into warm brown human skin elsewhere. Small backward-sweeping horns rise from her temples, one still partly covered by carefully pinned hair. Her eyes are dark hazel with narrow amber rings around the pupils, and a thin tail ends in a blunt, arrow-shaped point. She dresses in a patched scholar's robe over fitted leather armor, with one immaculate black glove that she removes only when handling books or spell components. Her clothing is practical but repeatedly altered, with uneven hems and visible repairs. Before she speaks, she often draws a quiet breath through her teeth, as if checking whether her voice still belongs to her.

Kett is quiet, observant, and unfailingly attentive to suffering. She is more comfortable with damaged books than with grieving people, yet she tries to help through practical acts, precise questions, and relentless preparation. She distrusts easy answers, especially religious ones, and has a dry sense of humor that appears most often when danger is near.

Kett Gask was born human in a river town where her family kept a modest archive of legal records, religious texts, and old maps. When a fever swept through the town, her younger brother became one of its first victims. The physicians failed him, the priests arrived too late, and Kett spent months searching forbidden medical treatises for a cure that did not exist. Her grief hardened into scholarship. She learned dead languages, copied occult diagrams, and followed scattered references to a power that could restore what mortal hands could not.