The Metalwood Saga / Reference Guide

Full-series spoilers

Soulmirror

The soulmirror is an ancient artifact consisting of an oval piece of mirrored glass surrounded by clear crystal, originally discovered in the Tomb of Akhenaten. It possesses the remarkable power to reveal a person's true self, and serves as the only weapon capable of breaking Cariel's dark soulmagic by forcing her to look at her own horrific reflection.