Transgress the Mind

You attempt to muddle the mind of a creature in range. When you cast this spell, target creature succeed make a Wisdom saving throw. On a failure, the creature may only cast spells of 3rd-level or lower. If target tries to cast a spell with a higher spell slot, it takes the effect of the original spell level. The creature may make a Wisdom saving throw at the end of its turn, ending the effect of this spell on a success.

At Higher Levels. If you cast this spell with a spell slot of 6th or 7th-level, the creature is limited to 2nd-level spells. If you use a spell slot of 8th-level or higher, the creature is limited to 1st-level spells.