Sentinel

4th Level Feat, Proficiency with Any Martial Weapon

Repeatable: No   You have mastered techniques to take advantage of every drop in any enemy’s guard, gaining the following benefits:   Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.
Guardian. Immediately after a creature within 5 feet of you takes the Disengage Action or hits a target other than you with an attack, you can make an Opportunity Attack against that creature.
Halt. When you hit a creature with an Opportunity Attack, the creature’s Speed becomes 0 for the rest of the turn.