The F-Rank Porter Owns Every Dungeon [OP Crafting LitRPG]

The calamity-class boss did not attack the abandoned porter. It knelt and returned his keys. Dohyun Kang has spent two years carrying potions and swords for a raid team that never bothered to learn his name. When the tunnel collapses and Raid Leader Kim Taewoon calls the retreat over everyone's head but his own combat team's, Dohyun stays behind anyway, digging through rubble with his bare hands for the vice leader and the wounded she's dragging with her. That's when he finds a rusted handle buried under the stone, and the calamity-class boss that just tore through the raid's entire barrier stops mid-swing to kneel in front of him. "Karvek, Keeper of the First Sealed Armory, confirms the Owner seal." Every dungeon monster in the world, it turns out, is equipment. Every boss is a guardian under contract. And Dohyun Kang, invisible, unranked, replaceable, is the registered Owner of all of it, whether the guilds and the state are willing to admit that on camera or not. He still can't fight. He's never put a single point into a combat stat. What he can do is lock a sword mid-swing before it lands, weld a dying man's chest plate shut using the blade a guild leader just tried to steal back, and make a calamity-class monster answer to him instead of the appraisal team trying to seize it live on the evening news. What to expect: - Immediate overpowered ownership that guilds, appraisers, and the state can't legally strip away - Practical, unglamorous power: repair, lock, restrain, redirect, not raw damage numbers - An autonomous boss guardian who follows the letter of his contract and not one inch more - Crafting and base expansion that grows every time Dohyun fixes something instead of hoarding it - A second Owner's handprint waiting on every map, promising he was never the only one with a claim New chapters posting regularly after launch.