unprophesied_of_ages

He's not getting out. Especially once the removable objects are gone. The bracers on his upper arms don't get removed, possibly because they're thoroughly attached to his arms via spikes, but he's left with no metalminds except the ones keeping him young. And, of course, a piece of gold he had implanted in his jaw after the incident with the beheading. This adds up to: No metallic means of escape.