User:Guy/Splat/Styles/Witch Hunting

You excel at tracking, hunting, and slaying spellcasters. Gain the following benefits:

You can use a bonus action to study a creature or object within 30 feet of you that you can see. In doing so you become aware if the creature or object is under the effect of a spell or not, but you gain no inherent knowledge of the spell or its effect.
When you damage a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain concentration.
Immediately after a creature adjacent to you casts a spell, or makes a spell attack roll, you can use your reaction to make a melee weapon attack or unarmed strike against that creature.
You have advantage on any saving throw against a spell cast by a creature adjacent to you.