Feeblemind

Schools: Enchantment (Compulsion) [Mind-Affecting]
Level: Sor/Wiz 5
Components: V, S, M
Casting Time: 1 action
Range: Medium (100 ft. + 10 ft./level)
Target: One creature
Duration: Instantaneous
Saving Throw: Will negates (see text)
Spell Resistance: Yes

The subject's Intelligence score drops to 1. Still, the creature knows who its friends are and can follow them and even protect them. The creature remains in this state until a heal, limited wish, miracle, or wish spell is used to cancel the effects. Creatures who can cast arcane spells or use arcane spell-like effects suffer a -4 penalty on their saving throws.