|The Moons of Mirrodin,The Darksteel Eye|
Bosh was an ancient golem of mysterious origin that lived on Mirrodin. Just like his companion Glissa Sunseeker, he sought the truth. His truth was his own lost memory, and an understanding of his place in a world he no longer recognized.
Presumably he was one of the golems Memnarch created to help him with his duties and quests; he was found by Slobad in the Mephidross. Bosh, likely from the dross's effects, had amnesia which was cured by the Pool of Knowledge. Over the course of his travels with Glissa and Slobad, Bosh's metallic body slowly transformed into flesh.