A '''{{PAGENAME}}''' is a [[Necron]] device used to see a representation of reality as it might have been, had fate taken another course. They have been observed within Necron [[Pharos (Device)|Pharos]] complexes.{{Fn|1}}

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Within Necron complexes, dimensional mirrors are sometimes found housed in an aperture five feet high, set in the side of cave with a base at about waist height. Its oval encompassed blackness, so it can initially appear to be a tunnel. Looking into it will show a variant of one's reflection, and those around, of other possible alternate realities. If one looks away from it for a time and then looks back it can show a kaleidoscopic display of variant caves, with multitude of version of the viewer also peering back. If an observer looks away from it for a time and look back again, it might have vanished without a trace, leaving no indication anything had been there prior.{{Fn|1}}