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Keywords are:  'cleric curse spell weaken'

Spell: weaken                   Mana:  15  Wis: 22  Chr: 18  Lvl 17 Cler  (28%)
                                (helpful)   Requires: clumsiness
                                Group: Cleric tribulation spellgroup
                                (Can Be Groupcast)
                                (Curse)

Usage:
cast weaken <target>

The 'weaken' curse lowers the target's strength if successful, and may cause
it to drop its weapons while fighting.

Weakness is a curse and is more effectively removed by the cleric spell
'lift curse' than by 'dispel magic'.