Black Karma Curse

(Player's Handbook II)

Enchantment (Compulsion) [Mind-Affecting]
Level: Cleric 2, Sorcerer 2, Wizard 2,
Components: V, S,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: Instantaneous
Saving Throw: Will negates
Spell Resistance: Yes

With a word and a gesture, you compel the bewildered creature to attack itself.
If the target creature's saving throw fails, it immediately takes damage as if it had hit itself with its currently wielded weapon (or natural weapon).
If the creature has more than one eligible attack form, it uses the one that deals the most damage.