This is an Undertale fan book/AU (Alternate Universe), and the sequel to HalonaTale: Arisen.
Frisk never thought she'd resort to violence. Never. Meeting a girl who's sworn to slaughter doesn't help. Frisk finds herself assisting her in eradicating the monster race. Will Frisk sort it out in the end? Or will she follow the girl's lead forever?
A/N: To understand everything completely in this story, you will have to play/watch Undertale and read the first part of HalonaTale.