Mirror That Holds Shadows was an information gathering artefact belonging to Skull Mask. This artefact had played a big role in allowing the Outsiders to operate carefully while staying out of sight. If it weren’t for the artefact, the Outsiders would have dispersed long ago .
It was a massive mirror that spanned the entire length of a room. The mirror was able to display not only the major facilities of each nation, but also detailed information that only locals would know.
Small and big events were all displayed on the mirror in real-time.With no limits, it could gather information about any ‘event’ happening from far away.