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Keywords are:  'cleric spell armor aegis'

Spell: armor aegis              Mana:   8  Wis: 13  Chr: 11  Lvl  3 Cler  (28%)
                                (critical)   
                                Group: Cleric divine aid spellgroup
                                (Can Be Groupcast)
                                (Can Be Maintained)

Usage:
cast armor aegis <target>

The 'armor aegis' spell adjusts your ac, or armor class. The higher your ac,
the better armored you are.  The better armored you are, the less average
damage you will take during a fight. This spell improves your armor class
by 20 points.

The armor aegis spell is a low level protective spell used extensively by
clerics to aid them in battle.  While not a very powerful spell, it can be
used in conjunction with other ac-increasing spells for maximum effect.