8th-level enchantment
Casting Time 1 action
Range 150 feet
Components V S M (Clay/crystal/glass/mineral spheres)
Duration Instantaneous

A creature you can see takes 4d6 psychic damage and makes an Intelligence save. On failure, its Intelligence and Charisma become 1. It can't cast spells, activate magic items, understand language, or communicate legibly by any means. However, it can identify allies, and follow and protect them.

Every 30 days, it can repeat the save, ending the spell on a success. Greater Restoration, Heal, and Wish also end it.