Bruiser, Unleashed Ogre Boss

Master Kidnapper. Bruiser has Advantage on checks made to grapple or restrain a Large or smaller creature. 

Bloodlust. If Bruiser or another creature Bruiser can see within 60ft of him falls below half their maximum HP, Bruiser enters a frenzied state, reducing his AC by 2, but giving all of his attacks advantage.

Multiattack. Bruiser can make three attacks with his Greatclub. Alternatively, he can replace one attack with his Greatclub for a Chain Sweep or Chain Wrap attack (if available).

Greatclub. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 5) bludgeoning damage.

Chain Wrap. Bruiser throws one of his chains at a Large or smaller creature he can see within 30ft of him. Bruiser and the target creature make a contested Athletics or Acrobatics check. If the target creature fails the check, they are pulled 15ft toward Bruiser and are restrained. Bruiser can use this action to automatically deal 15 (3d10) bludgeoning damage to any/all creature restrained by this attack. Bruiser can have up to four creatures restrained this attack, and Bruiser cannot use any Chain attacks if he has four creatures restrained this way.

Chain Sweep (Recharge 4-6). Bruiser swings the chains wrapped around his arms, and each creature within 10 feet of it must make a DC 17 Dexterity saving throw. On a failed saving throw, a creature takes 13 (2d8 + 5) bludgeoning damage and is knocked prone. On a successful save, the creature takes half as much damage and isn’t knocked prone.

Chain Parry. When Bruiser is hit by a melee attack, he can increase his AC by 2, possibly causing the attack to miss. If this feature causes an attack with a weapon to miss, Bruiser can roll an Athletics check (contested by an Athletics or Acrobatics check). If Bruiser succeeds, the attacker is disarmed and the weapon used in the attack is thrown 15ft in a randomly chosen direction.