Fate of Engineer in Magic World

It's the year 2201 but... Humanity has been invaded and destroyed, by Humans.. of another world. In the old world, Gillian was a prodigal Engineer and an avid fan of fantasy genre. But in this new one, he is a mere prisoner. The only reason why he is still alive is because the humans of the magic world want to learn about technology through him. Will he rot and die in this Prison? Will he be able escape? Or something else? What will be his fate?