You reach into the mind of a creature in the process of casting a spell and attempt to destroy that very thought. The target must succeed on a Wisdom saving throw. If the creature is casting a spell of 4th level or lower, its spell automatically fails and has no effect. If it is casting a spell of 5th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell fails and has no effect.
If the target fails the saving throw it takes 2d6 psychic damage per level of the spell the creature was attempting to cast.(i.e. if a 3rd level spell was cast the target would take 6d6 psychic damage.)
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.
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