Lord Wornir, best known as the conqueror of Carthus, sentenced countless souls to gruesome deaths, keen to outlive them all. He brought many lords to their knees and ground their crowns to dust. Then the crowns became one, and Wolnir, the one High Lord.
When Wolnir fell to the Abyss, he was gripped by a fear of true darkness, and pleaded to the gods for the first time. His holy sword, together with three armlets stripped from the corpses of clerics, gave him some semblance of comfort. In the Abyss, Wolnir discovered the Pyromancy that inspired the black arts of the grave wardens.
Deep inside the Catacombs of Carthus, a gigantic, skeletal incarnation of Wolnir can be fought by interacting with an ornate goblet.
Releases undulating black flames that trace the ground.
Be it sorcery or pyromancy, all techniques that infringe on humanity lead to the same place. That is to say, they all seek a will of their own.