Mage Hunter

Origin Feat

You gain the following benefits.

Sense Magic 

You always have detect magic prepared and can cast it once for free per long rest or using any spell slots you have. When you use the free casting of the spell, you can ignore Verbal Components of the spell. Additionally if you cast it as a ritual the duration is increased to 1 hour. 

Mage Bane

If an enemy within melee range casts a spell, you may make an opportunity attack targeting that enemy.