Hellhound's Soul

"Witchers are capable of extracting components even from the carcasses of unique creatures. This potion formula requires the iridescent mark of the mythical Hellhound, known also as the Beast. The resulting beverage causes further mutation in the witcher's body."

When imbibed, Hellhound's Soul, a mutagenic potion, adds one Silver talent, which can be used to acquire enhancements.