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Keywords are:  'mage spell displacement'

Spell: displacement             Mana:  30  Int: 24  Wis: 20  Lvl 19 Mage  (28%)
                                (helpful)   Requires: detect invisibility
                                Group: Mage illusion spellgroup

Usage:
cast displacement
cast displacement <target>

'Displacement' creates an distorted, illusory duplicate of the target that
follows it around, which makes them more difficult to hit in combat. It is
often used with the spells 'force shield' and 'armor' for maximum effect.

Displacement is used primarily in battle to protect warriors on the front
lines.  It will increase the armor class of the target by 40 points, which
makes it one of the more powerful combative protection spells. The higher
your ac, the better armored you are. The better armored you are, the less
average damage you will take during a fight.