Dampened Magic

When you cast Dampened Magic, choose a target within range. For the duration, you make their spells less effective. Whenever the target casts a spell, they must succeed on a DC equal to your spell save DC saving throw, using your spellcasting ability, or the spell that they cast fails, and the slot is wasted. If they succeed the saving throw, then they have disadvantage on attack rolls with the spell, or the target has advantage on the saving throw.