You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 4th level or lower, its spell 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 you successfully use this spell to stop a spell being cast, that spell's caster must succeed on a saving throw with its spellcasting ability or take 1d4 psychic damage per level of the interrupted spell.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the interrupted spell has no effect if its level is less than or equal to the level of the spell slot you used.
* - which you take when you see a creature within 60 feet of you casting a spell ** - (a ruby worth at least 25 gp)
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