Yennefer of Vengerberg was born with visible physical deformities and the ability to call upon Chaos to protect herself from an abusive stepfather.

Tissaia de Vries takes her to Aretuza where Yennefer proves herself a powerful mage novice. Once made a full mage, she is unhappy with her assignment to Nilfgaard and undergoes a magical transformation to secure a position at a more lucrative court.

In her travels, she encounters Geralt of Rivia and a djinn which results in a spell being cast that ties her fate to Geralt's for the rest of their lives whether they like it or not.

Eventually, she and Geralt become adoptive parents to Ciri.