You attempt to interrupt a creature in the process of casting a spell, or making an action. If the creature is casting a spell is of 3rd level or lower, its spell fails and it has no effect. If it is 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. Alternatively, if the creature is making a non-spell action, it must make a Wisdom saving throw vs your spell save DC. On a failed save, the creature is unable to make the intended action this turn, but does not use up its action this turn.
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.
"How easily your flames are quenched"
Ungorath, Dain's mentor.
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