The Glass Key

Daniel is apprenticed to a master tinker in the Kingdom of Chicagoland, a society built in the ruins of the old high-tech world. When he breaks a piece of precious ancient glass, Master Nieve commands him to journey to a landfill guarded by ancient war bots to secure more. From there, he will find that the ancient world isn't as dead as everyone believes, and he'll have to think fast to survive!