You’ve developed the skills necessary to hold your own in close-quarters grappling. You gain the following benefits:

• You have advantage on attack rolls against a creature you are grappling.
• You can use your action to try to pin a creature grappled by you. To do so, make another grapple check. If you succeed, the creature is restrained until the grapple ends.
• You may take 2 actions against a creature that you are currently grappling.  
• Creatures that you are grappling absorb 25% of physical attack damage that you receive.