Expelled from the Guild, I Built a Living Dungeon Where Heroes and Monsters Live Together

Ren wakes up as the heart of a living dungeon in another world and has to keep monsters and heroes from killing each other. He is pulled into fights he would rather solve with words, rules, and a careful pause before blood spills. A hidden tablet pings when people speak in public, a rare drop in his coat reacts to every gate, and a box of pressed flowers points to one person who has been lying for forty years. Ren keeps trying to act like a wall, but the dungeon only survives because he keeps standing between both sides. The next visitor knows his old name.