Thornn (Lucia Callasantos) with a wolf like-appearance and fight with animal reflexes she is the sister of Feral.
Lucia and her sister Maria were born in Bronx, New York. They grew in family with an abusive father who abandoned they family. After their father left the family their mother remarried a man who was cruel to Lucia and Maria. Mrs. Callasntos new boyfriend attacked Lucia, Maria killed him to save her sister. When their mother killed Maria's birds for the death of her boyfriend Maria killed their mother then the sisters left home and joined the Morlocks. Thornn and her sister Feral were among the many mutants depowered by Scarlett Witch but they were repowered by the power of lycanthropy.
Transforms into a yellow demonic humanoid with large red thorns jutting from the arms and legs. He has the ability to throw explosive or stunning thorns.