Philosopher's Stone

The Philosopher's Stone is a magical object connected to the Sabbath ritual performed by Wiseman, which forced numerous Gates into despair and giving birth to their respective Phantoms.

The Phantom Gremlin, who goes by his human name, Sora, knows of the Philosopher's Stone and its connection to the Sabbath, he revealed this to Wiseman when he was chained up after releasing the chained rogue Phantom Legion to learn more as he was curious as to the Phantom's objective of starting the Sabbath again. This revelation led Wiseman to not only spare Gremlin his planned execution, but to make him his right-hand man.