Witchcraft

Kalliope Crystal can do magic. The creatures of Mother Earth speak to her, the blood in her veins are scream the truth of her power, the shine of her golden eyes isn't normal. Her past has been wiped out of her memory, and when the woman with the weird hat, who calls herself Minerva, takes pity on her, she's allowed to cultivate her magic.
"You're a witch, Kalliope."

Chamber of Secrets -- Goblet of Fire