Ruby's Inferno

Ruby Blackburn was born from a forbidden bond-her mother, Maela Emberwick, a sharp-witted halfling witch, and her father, a literal devil, an infernal lord who walked the mortal plane in secret. Ruby inherited her mother's small stature and cunning, and her father's smoldering, hellborn power.
When Ruby reached adulthood, she met Thalen Crest, a brilliant but reckless scholar-warrior belonging to a shadow faction called Dustwind Consortium. They specialized in curse-breaking, demon-binding, and hunting rogue magic.
Ruby married him.
They became unstoppable.
Until the ambush.
They murdered Thalen.
They tried to break her.

Instead, they forged her.