Monitor

You have mastered how to watch over your enemy to great effect, you gain the following benefits:

• You are able to make a reaction attack whenever your enemy uses a feat or uses an item.
• If a enemy rolls stealth while within five feet of you and your are not engaged with another enemy you will be able to see them and they don't gain advantage on you due to the stealth.
• When taking attack of opportunity you have advantage on the attack roll.