Anti-Mage Training. If you have the mage slayer feat. You can now attempt to interrupt the spell being cast. When a creature within 15 ft of you begins to cast a spell, you can can use your reaction to make a melee weapon attack that has reach against that creature. That creature must make a concentration check as if concentrating on that spell or the spell is lost. When you damage a creature that is concentrating on a spell or casting a spell the concentration check for that spell is equal to the damage dealt (instead of 1/2).
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