You have focused your training on the art of disrupting magic-users, mastering techniques that make spellcasters seriously reconsider targeting you. You gain the following benefits:

• Whenever a creature within 5 feet of you casts a spell, you can use your reaction to make a melee weapon attack against that creature.
• If you successfully hit a creature with a melee attack, and that creature is concentrating on a spell, they have disadvantage on the saving throw to maintain their concentration.
• You gain advantage on saving throws against spells cast by creatures within 5 feet of you.

Your deep understanding of how to counter magic makes you a formidable adversary against any who wield it.