Bestiary Fragment is a letter in Thronebreaker: The Witcher Tales. It can be looted off a corpse on The Serpent of Foregate battlefield.
Journal entry[]
...few remedies exist for a man who has lost his youthful vigor. The recommended solution is a simple mixture of raw dragon egg, a sprinkle of sugar, and a splash of pepper vodka. Should no dragon eggs be readily available, instead boil the liver of cockatrice after first massaging in a blend of Zerrikanian spices...