Tissaia de Vries

Tissaia de Vries was a sorceress and a member of the Council of Sorcerers. She studied in Aretuza.

After the mutiny on Thanedd Island, Tissaia committed suicide. Together with the other losses, her death spelled the end of the Council, making way for Lodge of Sorceresses and the like.

De Vries' Extract is a potion that enables a witcher to see things that are hidden, whether they be behind a wall or spirits.

An in-game book, Sorceresses and Sorcerers, mentions her sad end.

Trivia

 * De Vries is a common Dutch surname meaning, essentially, the Frisian.