Coming from a family of merchants, Dratena obtained the taboo skill "Necromancy" by eating an Skill Fruit at the age of twelve. As her mother died and her family nearly fall into ruin, Dratena was expelled by her own father who accused her to be a cursed child due to her skill. She was later taken in by Holy Sister, who raised her under her tutelage. She is now a member of the mysterious group Black Swan.

(Source: Hazure Skill Kinomi Master Wiki)