The Blood and Wine expansion added a lot to The Witcher 3, including new characters, the Skellige Gwent deck, and one of the most beautiful locations in the game, Toussaint. Another excellent addition, though, was the mutations. These powerful new abilities became the focal point of every The Witcher 3 character build going forward, and it's easy to see why most players barrel through the DLC until the moment they unlock this quest.