Dungeons & Dragons 5e Element 133 Class Feature: Sentry

If the Host is within 30 feet of your Thrall and is targeted for an attack. As a reaction your Thrall can release a roar of rage causing a disadvantage on the attack roll. Your Thrall also gains an extra 1d12 of damage to that creature, and when targeted by an attack from that creature gains a +2 to AC against that creature. This lasts for one minute or until the target creature attacks any one other than your Host or Thrall. Your Thrall can use this feature as many times as its CON mod per long rest.

Additionally, the following now applies to your Thrall; 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's speed becomes 0 for the rest of the turn.
• Creatures provoke opportunity attacks from you even if they take the Disengage action before leaving your reach.
• When a creature makes an attack against a target other than you (the Thrall), you can use your reaction to make a melee weapon attack against the attacking creature.