Odyssey from Netherworld

Netherworld overlaps with reality, black holes erupt, and Phantoms wreak havoc, Earth becomes a living hell. Ash Loring, betrayed and banished to the Abyss, unexpectedly activates the Devourer System, allowing him to consume dark obsessions and gain powers. Revived with strength, he seeks revenge and the truth of the Netherworld. Pursuing the S-class "Oath Bride", collecting Abyss Marks, and leading the Anti-Obsession Squad through dangerous zones like the Fallen Hospital, Ash battles back to the human world. Crushing his enemies and exposing a vast conspiracy, he becomes the master of the Abyss and ruler of the world.