Crown of Thorns

4th-level enchantment
Casting time: 1 action
Range: 30 feet
Target:
Components: V, S, M (a piece of throned vine)
Duration: Concentration, up to 1 minute
Classes: Druid, Sorcerer, Warlock, Wizard
Subclasses:

You create a psychic binding on the mind of a creature within range. Until this spell ends, the creature must make a Charisma saving throw each time it casts a spell. On a failed save, it takes 2d6 psychic damage, and it fails to cast the spell. It doesn’t expend a spell slot if it fails to cast the spell.