Anti-Magic

You know through the fighting of spell casters how to defeat these dangerous enemies. 

• When a creature within 5 feet of you casts a spell, you can use your reaction to make a melee weapon attack against that creature.
• You can add half your proficiency bonus to saving throws against spells cast by creatures you can see.
• When you are targeted by a spell attack, you can place a penalty equal to half your proficiency bonus on the attack roll when you can see the creature who cast the spell.