The Ascension of a Coward Princess

Isabel Rigris, being a second princess born from the famous Family of Excellent Knights, the Rigris family, she was very coward. She never hold a sword in her life. After reaching the age of Class identification ceremony, she was been determined as classless. Being classless as well as having a rare white hair and silver eyes features this further makes her a source of disgust to the family. Then one day she was forcibly send to a mission to subjugate goblins in the forest together with other problem childs of other noble family to awaken their talents through life and death situation. But never been in their wildest dream that they will be attacked by the demonbeast. A Demon general took fancy of Isabel and injected her a rare ability that made her a monster on rampage.

What will be the fate of a useless princess that was been a recipient of an unknown ability from a demon General?