"The Witcher 4" universe. "Immunity at the cost of humanity".

At the height of the Catriona plague, this sorcerer treated the sick, but the fear of dying after his colleagues drove him mad. Remembering the experiments of Malaspina and Alzur, who once created elixirs for witcher mutations, he decided to replicate their success to protect his body from poisons. But homemade magic twisted the spell. The transformation warped his flesh right inside the plague doctor's attire, making the suit a part of his new anatomy. The mask's lenses became burning eyes, and the leather beak turned into a fanged maw. The mage gained his immunity, but ceased to be human forever.