The Kolad Shards

Enlightenment of the blind idiot god

5-level Transmutation (ritual)

This spell crushes the mind of a creature you can see within range. The target must succeed on an Intelligence saving throw or this spell reduces the target's Intelligence score to 1. It cannot understand even simple words or phrases, although it recalls basic feelings toward friends and foes and can be guided with Wisdom (Animal Handling) check. It can't cast spells. If you maintain concentration on the spell for 8 hours, it continues to the maximum duration without further concentration.