My Gift Lvl 9999 Unlimited Gacha: Backstabbed in a Backwater Dungeon, I'm Out for Revenge!

Left for dead by supposed comrades, a novice discovers his «useless» gift draws companions and artifacts from an endless pool. In a sealed dungeon he summons warriors, crafters, and scouts whose loyalty is baked into the contract, then turns the labyrinth into a base with farms, workshops, and a map room. Raids reclaim relics and information the surface hoards; blackmail files and decisive strikes unspool the plot that branded him expendable. He learns to manage morale, logistics, and succession while the team debates whether revenge ends at the ringleaders or at the system that rewards betrayal. Nobles try to buy or steal the gacha; guilds try to regulate it; churches call it blasphemy. The fortress survives sieges because its people believe in the life they are building, not just the score to settle. When the final confrontation arrives, the question is what future his family of summons will inherit once the ledger is closed.