Sentinel- Rebalanced

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

• When you hit a creature with an opportunity attack, the creature must make a Dex saving throw (DC 13). On failure, you knock the target prone.
• Creatures provoke opportunity attacks from you even if they take the Disengage action before leaving your reach.
• When a creature within your reach of you 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 melee weapon attack against the attacking creature.