Relating to or resembling an eidolon; phantom-like, ghostly, or having the quality of an illusion or phantom.
From 'eidolon' (phantom) plus the suffix '-ic' (relating to or characterized by), creating an adjective form describing something that has phantom-like qualities.
The word 'eidolic' perfectly captures that eerie, hard-to-pin-down quality of things glimpsed in peripheral vision—your brain creating phantom images from incomplete sensory data, which is exactly what magicians exploit.
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