My Ultimate Summoning System: I have an Infinite Evolving Slime

Dean Faust was many things. A disgraced MMA fighter. A lifelong orphan. A man who somehow managed to die slipping on his dog's pee. Imagine dying to Pee-kun. Not exactly the origin story of legends. But when he wakes up in the body of Dean Gray, the only son of a declining blacksmith family. He finds himself in a world where humanity is forced into a single fortress city, surrounded by monsters that want them dead. At this point, legends don't really care about your origin story. In this world, your familiar is everything. Your summon determines your rank, your worth and your future. So when Dean's third and final summoning attempt produces a small rainbow slime that freezes every assessment device in the room, nobody knows whether to laugh or run. The WSA sends an evaluation notice within hours and then everyone knows not to laugh. Because whatever this slime is, the world has no classification for it. No rank nor ability scan. Just one word from a system that only Dean can see. Paradox. Now Dean has to navigate a world he barely understands, a family he never knew he needed, and every major faction in the Fortress City quietly deciding what to do about a blacksmith's son with an unclassifiable familiar and his incredible growth through a system that rewards him for simply choosing to survive. The slime can copy, evolve, adapt and permanently absorb any ability it encounters. The world has no idea what that means yet. Neither does Dean. But they're all about to find out.