UPDATED BRAWLER MONK SUBCLASS

This was for a level 12 Campaign so I didn't make a 17th level feature.

Brawler Monk Subclass 

3rd Level — Haymaker

Your Martial Arts die increases by one step, to a maximum of 1d12. When you hit a creature with an unarmed strike, your next attack against that creature is made with advantage.

3rd Level — Extended Flurry

Whenever you hit a creature with two unarmed strikes, you can make one additional unarmed strike as part of that action. You can use this feature once per turn.

6th Level — Close Quarters

When you use your Flurry of Blows, you gain a bonus to your Armor Class equal to half your Martial Arts die (rounded up). This bonus lasts until the start of your next turn.

11th Level — Avulsion

When you land five unarmed strikes against the same creature in a single turn, it takes extra thunder damage equal to your monk level and is knocked 10 feet away from you.

NOTES:
* Close Quarters Armor Bonus requires you to roll your Martial Arts die.