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Keywords are:  'mage spell silhouette silouhette'

Spell: silhouette               Mana:  48  Int: 33  Wis: 29  Lvl 33 Mage  (42%)
                                (obscure)   Requires: darken and displacement
                                Group: Mage illusion spellgroup

Usage:
cast silhouette

'Silhouette' is an uncommon illusion spell that combines the darken spell
with a displacement effect to create a shadowy outline of the caster that
follows and imitates their every move. As it is merely an image and not
a shadow construct, it has no substance to strike. As the image is simply
a hazy black outline that is difficult to see in bright light or under
shadowy conditions, it would be very unlikely that an opponent would
confuse it for the caster, even in the thick of combat. Unlike darken
and displacement, it cannot be cast on others.

Given its high casting requirements and its lack of practical uses,
silhouette is not widely known or taught.