When a creature within melee range of you is in the process of casting a spell, you may use your reaction to attempt to interrupt that spell. When you do so, make an attack roll with a weapon of your choice. Instead of taking damage, that creature must make a Constitution saving throw equal to your attack roll.
If the creature fails to do so, the spell fails and has no effect.
You may use this ability a number of times per short or long rest equal to your proficiency bonus.
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