Base Class: Fighter
You strengthen your fists and are difficult to hit, as your skin is tough as your armor. You gain abilities similar to both the Monk and barbarian, though cannot rage or use ki. However, you gain powerful strikes with your arms and resilience similar to a barbarian's.
Iron Hide
Your skin hardens like stone, and your fists hit like steel. Your armor class increases by one, and your unarmed strikes count as melee weapons, with the light property. You deal additional damage with them equal to your constitution modifier.
Chain Pummel
At the end of your turn as a bonus action, you may make a number of unarmed strikes against a creature in range equal to the number of times you hit it this turn.
Finisher
Once per turn, you may cause an attack from Chain Pummel deal double damage,
Cling to Life
When you fail 3 death saving throws, you may make another death saving throw. If you succeed and have three successful saves, you are stable, as if you had never failed thrice.
Heavy Blow
When you hit a creature with an unarmed strike, you may attempt to shove the creature. Succeed or fail, the creature targeted by this feature cannot be shoved in this way untill the start of your next turn.