Lord of the Mysteries by Cuttlefish That Loves Diving is a dark fantasy web novel set in a Victorian-era world filled with secret organizations, eldritch gods, and mystical potions that grant supernatural powers. The story follows Zhou Mingrui, who reincarnates as Klein Moretti and joins the Nighthawks, a group that fights dangerous supernatural threats, while secretly advancing through magical “Sequences” to grow stronger. As Klein uncovers ancient conspiracies and forms the mysterious Tarot Club, he becomes entangled in conflicts involving hidden deities, forbidden knowledge, and the terrifying truths behind the world’s structure, blending mystery, horror, steampunk, and intricate power systems into a slow-burn, highly layered narrative.