You have mastered techniques useful in combat against spellcasters, gaining the following benefits:
- When a creature within 5 feet of you casts a spell, you can use your reaction to make a melee attack against that creature.
- When you damage a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration.
- You have advantage on contested checks against spells cast by creatures that you can sense.