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Keywords are:  'cleric curse spell cloud noxious stinking'

Spell: noxious cloud            Mana:  12  Wis: 24  Chr: 20  Lvl 16 Cler  (28%)
                                (helpful)   Requires: faerie fire
                                Group: Cleric tribulation spellgroup
                                Damage Type: toxic / breath
                                Damage: moderate (special, see text)  
                                Speed: average
                                (Can Be Groupcast)
                                (Curse)

Usage:
cast noxious cloud <target>

'Noxious cloud' is an unusual curse.  The caster calls forth a cloud of
putrid gas to engulf the target. The target takes an initial burst of toxic
breath damage and living creatures are nauseated.  The cloud then continues
to hover about the target for some time, reducing charisma as well as mana
and movement regeneration.