Yoke of Mercy

(Book of Exalted Deeds)

Enchantment (Compulsion) [Good, Mind-Affecting]
Level: Apostle of Peace 2, Sorcerer 2, Wizard 2,
Components: V, Abstinence
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: 1 round/level
Saving Throw: Will negates
Spell Resistance: No

This spell compels a creature up to 4 HD more than the caster's level to fight in a merciful manner.
Specifically, the creature deals nonlethal damage with its attacks, avoids using damaging spells or spell-like abilities, and does not deliver a coup de grace to a helpless foe.
Abstinence Component: You must not have dealt damage, by spell or any other means, to another living creature within the last 8 hours before casting this spell.