Cauldron of Resonance

The Cauldron of Resonance was a powerful mechanism used to project a time barrier around the island of Hōraijima. It was later corrupted by the Four War Gods and used to sustain their powers. It was damaged by Inuyasha and later destroyed completely by his brother, Sesshōmaru, during the latter's battle with Kyōra. Because the Cauldron was a vital part of the island, after it was destroyed, the island later vanished following the conclusion of Inuyasha's battle with the Four War Gods.