Through intensive training(getting into 1000s of fights with random people over relatively unimportant matters) your body has become both a weapon and a shield. Nothing gives you more joy than a recreational fight with someone stronger than yourself.

Seasoned Fighter Scaling

Your unarmored ac increases by 1, you also gain cold and fire resistance.

Level 3: Seasoned Fighter

Your unarmored defense is increased to 12 while not wearing any armor or a shield. When you reach level 10 in this class your unarmored defense increases to 13 and you gain resistance to fire and cold damage.

 

Your unarmed strike damage increases as you level up in this class. The increase is listed below.

• Level 3: 1D6
• Level 6: 1D8
• Level 10: 1D10

 

Level 3: Ambidextrous

You are able to make an additional unarmed strike as a bonus action. You have two additional unarmed strikes as part of the bonus action at level 10. Your strength modifier is added to your off hand attacks.

Level 6: Smash and Grab

• When you hit a creature with an Unarmed Strike as part of the Attack action on your turn, you can use both the Damage and the Grapple option. You can use this benefit only once per turn. You can only have 2 targets grappled at a time. This can be stacked with the grappler feat, allowing you to grapple two creatures per turn and allowing you to have up to three creatures grappled at once. If you have three creatures grappled you are unable to attack or move, but can only maintain your grip. The only action that can be performed while grappling three creatures is Death Roll.

 

• When using unarmed strikes or wrestling moves you may now choose to do either Bludgeoning or force damage.

QUICKNOTE: If attempting to grapple a creature, it must make a strength/dexterity saving throw(it chooses) against your Strength DC.

Level 6: Crushing Slam

In place of one of your bonus action attacks, you may perform a Slam attack on a grappled target. Doing so ends the grapple. The target must make a strength/dexterity saving throw. If it succeeds, it manages to break the grapple and nothing else happens. If it fails, you lift the target and slam it into the ground, knocking them prone and dealing damage based on your unarmed damage. You can use reckless attack to give the target disadvantage on its saving throw and you may forgo the disadvantage for brutal strike.

Level 10: Uninhibited Speed

• You gain 10ft of movement speed when unarmored. 
• You may also perform Ravenous Leap when not wearing any armor. As a bonus action you can leap a distance equal to your movement speed. Using this ability when threatened by an enemy results in them getting an attack of opportunity.

Level 10: Clothesline

In place of one of your bonus action attacks, if you moved at least 10 feet towards your target you can perform a Clothesline. The target must succeed at a strength/dexterity save or be knocked to the ground and take damage equal to “Crushing Slam” damage. . You can use reckless attack to give the target disadvantage on its saving throw and you may forgo the disadvantage for brutal strike.

Level 14: Physically Unmatched

You have become a beacon of physical power. Any who compete with you are destined to be defeated. You gain an additional +4 to all DC saves made against your grapples, slams, clothesline, and deathroll abilities.  

Level 14: Death Roll

If at any point you have three creatures grappled you may perform "Death Roll" in place of one of your bonus action attacks. You begin violently spinning while trying to maintain your hold on the three targets. All three creatures must make a strength/dexterity saving throw. If any succeed, they manages to break the grapple and nothing else happens. If they fail, you roll violently while holding them, throwing them back 5ft and knocking them prone, also dealing damage based on your unarmed damage.