Prerequisite: Mage Slayer Feat
When a creature you can see casts a spell, you can use your reaction to move up to half your speed towards the creature and make a melee or ranged attack against it.
If the attack hits, the creature must make a concentration check with a DC equal to 10 or half the damage you dealt, whichever is higher. On a failed save, the creature's spell fails and has no effect, and the spell slot is expended.
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