Nameless explores the depths beneath Seira, where he discovers a vast hall containing an ancient throne and the remains of a civilization.

Soon, a mysterious inhabitant of this forgotten City appears and reveals more about the downfall of the underwater city.

But how are an ancient apocalypse, a lost civilization, the Reaper, and the Judge connected to the present?

These are the questions Nameless must answer if he wants to prevent an another catastrophe.