After killing the leader demon, William looked down at its lifeless body, a hint of regret crossing his mind. "Oh, how I would've loved to turn you into one of my undead," he mumbled, "but that would be a waste of such a precious sacrifice."
Realizing the potential in front of him, William activated his Divine talents. "Seal, Heart of Calamity," he murmured under his breath. Once again, the phantom appeared behind him, a white-robed figure wrapped in chains, its ethereal eyes glowing with intense white flame.
As William's words left his lips, the chains materialized and wrapped around the phantom, slowly sealing its power back into dormancy. The blazing white light from the phantom's eyes dimmed, and with a final snap of the chains, it vanished, locking away the overwhelming Soul Purity that had been released.