You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect. If it is casting a spell of 4th 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.
At Higher Levels: When you cast this spell using a spell slot of 4th 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.
You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect. If it is casting a spell of 4th 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 a spell is interrupted using a successful ability check, the casting creature may attempt to save the spell slot used in casting the failed spell. The creature makes an ability check using its own spellcasting ability against the same DC. On a success, the spell slot is saved. On a failure, the spell slot is expended.
If a spell is cast from a spell scroll and fails, the stored spell is not expended.
At Higher Levels: When you cast this spell using a spell slot of 4th 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.