Pin em down

You have mastered techniques to take advantage of every drop in any enemy's guard, gaining the following benefits:

• Opportunity attack proc when a creature moves within your ranged weapon attack range
• When you hit a creature with an opportunity attack, the creature's speed becomes 0 for the rest of the turn.
• When a creature within your attack range makes an attack against a target other than you (and that target doesn't have this feat), you can use your reaction to make a range weapon attack against the attacking creature.