"The Pugilist: A Streetfighting Class with Swagger to Spare" by Benjamin Huffman, DMsGuild
Pugilists who fight in the Squared Circle know you don’t have to knock an opponent senseless to get them to submit. Of course, members of the Squared Circle do beat their opponents senseless, they just know they don’t have to.
Groundwork
Starting when you choose this fight club at 3rd level, you gain the following additional moxie features.
When a creature attempts to break your grapple and succeeds, you can use your reaction and spend 1 moxie point to force the creature to roll again. The creature must use the second result.
When a hostile creature’s movement provokes an opportunity attack from you, you can use your reaction and spend 1 moxie point to attempt to grapple the creature instead of making an opportunity attack.
You can use a bonus action and spend 1 moxie point to make a Strength (Athletics) check with a DC equal to the AC of one creature within 5 feet of you. On a success, you grapple the creature and knock it prone.
Muscle Mass
Also at 3rd level, you gain proficiency in Athletics if you don’t already have it. If you do already have proficiency in Athletics, your proficiency bonus is doubled for any ability check that uses that proficiency.
Meat Shield
Starting at 6th level, when you have an enemy creature grappled, you gain half cover against all attacks made against you by a creature you are not grappling. When a weapon attack made by a creature you are not grappling misses you, you can use your reaction and spend 1 moxie point to have that creature make the same attack with a new roll against an enemy creature you are grappling.
Heavyweight
Starting at 11th level, you count as being one size larger for the purposes of grappling and shoving. In addition, you can move your full movement speed when you are dragging or carrying a grappled creature your size or smaller.
Clean Finish
At 17th level, your mastery of grappling reaches its peak. While you have a creature grappled, you gain advantage on all attacks against it. Additionally, when you make an unarmed strike or pugilist weapon attack against a creature you have grappled, you score a critical hit on a roll of 19 or 20 on the d20.