The White Lady is a special type of noonwraith in The Witcher 3: Wild Hunt. According to Helma, a resident of Farcorners, this specter was formerly a woman named Luzi, who committed suicide after abandoning her wedding for unknown reasons. She ran into the fields west of Drahim Castle and slashed her wrists with a dagger, transforming her into a noonwraith.
The apparition haunting the fields outside Novigrad turned out to be a noonwraith. Some powerful emotion must have bound it to that place – love, hate, anger or perhaps all three at once. Like every wraith of this type, she was surely capable of forming mirror images of herself, which served to mislead opponents and restore her vitality. Luckily, these mirages could be dispelled with a quick slash from a silver blade. Like any noonwraith, she would undoubtedly seek to assume immaterial form while fighting, making her almost impossible to injure – unless she is first caught in a trap laid by the Yrden Sign, ore blasted with a special bomb. Once thus forced into materiality, she should be attacked with strong blows or the Igni Sign. Finally, one must always keep in mind two witcher sayings: "The longer you fight a noonwraith, the lower your chances of surviving," and "Fight a noonwraith at midday and you'll be dead before dusk."