Tren Wholecrest

A ranger living in the woods nearby. Her father had the voidblight and neglected to tell anyone.
When she was young, she moved away with her girlfriend, a Druid named lily. They loved each other and cared deeply for the valley, cultivating it into something great. Trill gifted them a child in return, a beautiful baby boy. And yet, on a fateful night, Tren's voidblight manifested. Out of control, she killed Lily.
This happened last month, and she fears It will happen again in three days when the twin moons are gone. She wants to travel with the party back to civilization to try to get her voidblight cured, but above all, she wants to cure her son.
She keeps this all secret from the party so they don't bring judgement. On the second day, if the party isn't close to town, she'll get antsy as hell, pushing them to move faster because she needs to get to a big city soon.
If they take a third night, she'll reveal the truth to the party right as a cloud moves away from the moon, transforming her into a voidblight and putting her in a feral rage.
She's also 1/12th tiefling on her mother's side, so she's got horns.