Wrath of Asmodeus
Island of Abyss
Since the world began this tiny island was inhabited by the demon cultists. It is said it had been poisoned and corrupted by the various sacrifices and rituals that are carried out when the world was just born. No one knows what’s goes on in the island as no one dares enter it for fear of being corrupted.
Even during the Cataclysm Asmodeus didn’t dare touch it fearing that the residents would ask Demogorgon or another Demon Lord to aid them leading to his destruction.