Unknowable Hatred

You attempt to corrupt the mind of a creature that you can see within range, to fill it with Hadar's hate and hunger. The target immediately takes 4d6 psychic damage and must make an Intelligence saving throw.

On a failed save, the creature's Wisdom score becomes 1. The creature must use its action on each of its turns to attack the creature nearest to it, or move toward that creature if it is beyond the range of its attacks.

If there are multiple creatures at the same distance from it, the affected creature selects one of them at random. If the target cannot see any creatures, then it will look after its physiological needs, such as eating and sleeping, but will do nothing else. At the end of every 24 hours, the creature can repeat its saving throw against this spell. If it succeeds on its saving throw, the spell ends, and its Wisdom score reverts to its original state.

The spell can also be ended by the Greater Restoration or Wish spells.