Lord Maron: The Lord of Nightmares.

Plot Summary: Akira Kurozaki was an ordinary, quiet college student—withdrawn, analytical, and obsessed with strategy games and occult lore. His favorite game, Eidolon Abyss, allowed players to command nightmarish entities and reshape entire worlds through fear and illusion. But on the day the servers were set to shut down, Akira stayed logged in until the very end… only to awaken inside the game itself. He is no longer Akira. He is Lord Maron, the Supreme Sovereign of the Noctis Dominion—a shadow empire existing between dreams and reality, feared even by gods. His avatar manifests as a young, dark-haired noble clad in flowing black and violet robes, wielding a sentient arcane rod that bends nightmares into reality. Around him float cursed tarot-like cards, each containing sealed horrors and forgotten spells. Unlike typical isekai heroes, Maron is not summoned to save the world—he is misunderstood as its greatest threat. The World: The world of Eidolon Abyss is divided into kingdoms, divine territories, and fractured realms governed by ancient laws of magic. But hidden beneath all of them is the Veil of Dreams—a suppressed dimension where Maron’s dominion thrives. His sudden “awakening” begins to destabilize reality itself, causing nightmares to bleed into the waking world. Legends speak of a sealed “Nightmare King” who once nearly consumed existence. Now, the people whisper: has he returned?