Revenge is a dish best served cold, with dollop of whipped suffering and a sauce of acute humiliation.
Karma would do anything to exact revenge on the one who was responsible for her mother's death, her father's disdain and distrust, and a miserable life.
She was manipulated, maltreated, and humiliated by the one she trusted the most. Her stepsister!!
Discovering she had only three days left to live, Karma would go to any length to exact revenge. Even offering herself to the scary and powerful demon overlord.
A contract. Blood oath. Manipulation. Betrayal. And lots and lots of revenge.