You've developed the skills necessary to choke and break limbs in close-quarters grappling. You gain the following benefits:

• You have advantage and add both your Strength and Dexterity bonuses to your grapple attack roll.
• Hold: You can use your action to try to pin a creature grappled by you. To do so, make another grapple check. If you succeed, you and the creature are both restrained until the grapple ends.
• Choke: After a successful grapple, as a bonus action, you may choose to apply a choke to your opponent. Make an additional grapple check, and if successful, the creature of small or medium size, is rendered unconscious as with the Sleep spell for 1d6 rounds.
• Break Limb: After a successful grapple, as a bonus action, you may choose to break a limb of your opponent. Make an additional grapple check, and if successful, the creature of small or medium size, has one of its limbs broken.  Roll a 1d4, 1-2 an arm; 3-4 a leg.  A creature with its weapon arm broken has disadvantage on all attacks; a creature with a broken leg is reduced to crawling movement at 5 ft per turn and remains prone.
• Counter Grappler: You are comfortable even If successfully grappled and pinned yourself, by a small or medium creature. As a reaction you may use your Hold, Choke, Break Limb technique; any success also un-restrains yourself.