Dullmind

You blast the mind of a creature that you can see within range, attempting to shatter its intellect and personality. The target takes 2d6 psychic and 5d10 force damage and must make an Intelligence saving throw.

On a failed save, the creature's Intelligence, Wisdom and Charisma scores become 5. The creature can't cast spells, activate magic items.

At the end of every 60 days, the creature can repeat its saving throw against this spell. If it succeeds on its saving throw three times in a row, the spell ends.

The spell can also be ended by wish.