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Keywords are:  'cleric spell presence'

Spell: presence                 Mana:  18  Wis: 21  Chr: 17  Lvl 13 Cler  (28%)
                                (helpful)   Requires: peace
                                Group: Cleric tranquility spellgroup
                                (Can Be Groupcast)

Usage:
cast presence

'Presence' directly increases your charisma.  This spell can be very useful
in some situations, as it can prevent creatures from attacking you. It has
a handful of other applications, not the least of which is boosting your charisma
to meet the requirements to cast other cleric spells.

Presence can be cast multiple times, and its effects stack, up to +5 charisma.