Lord of the Mysteries (Chinese: 诡秘之主) is a titan of modern web fiction, widely regarded as a masterpiece of the "Gothic Horror" and "Steampunk" genres. Authored by the visionary Cuttlefish That Loves Diving, the series has redefined the standards of world-building in speculative fiction. It is celebrated for its dense, Victorian-era atmosphere and its "Hard" magic system based on 22 distinct Beyonder Pathways. By blending Cthulhu-inspired cosmic horror with the gritty reality of an industrial revolution, the narrative creates a world where knowledge is as dangerous as it is powerful, and every step toward divinity risks a descent into madness.

The story follows Zhou Mingrui, who finds himself transmigrated into the body of Klein Moretti in the Kingdom of Loen. Discovering a world governed by hidden gods and secret organizations, Klein must navigate a treacherous landscape of ritual magic and supernatural potions to uncover the truth of his arrival. To survive and protect those he cares about, he establishes the Tarot Club, adopting the persona of "The Fool"—a mysterious, ancient entity. As he gathers a group of elite "Beyonders" under his wing, Klein embarks on a journey to unravel the mysteries of the spirit world and the forgotten history of the "Great Old Ones."

Alternative Names by Language
诡秘之主 / Lord of the Mysteries / Повелитель Тайн / سيد الألغاز / ราชันเร้นลับ / 诡秘之主 / 詭秘之主 / 신비의 제왕