The Metalwood Saga / Reference Guide

Full-series spoilers

Device

The Device is a massive, technological and magical construct secretly built by Talon beneath the city of Ilyrion in the headquarters of Memory. Functioning as an intricate network of metal, wires, and screens, it is powered by fourteen interconnected Books of Amplification, allowing a bound user like Rylan to channel immense darkprime energy on a globally devastating scale.