Pit Dog

Whether they fight to live or live to fight, those who embody the Pit Dog bet their lives on every battle.

Brawler

When you choose this archetype at 3rd level, you gain proficiency with improvised weapons.
The damage you deal with unarmed strikes and improvised weapons is now replaced by your brawling die, which is a d4. Additionally, you can add your brawling die to grapple checks. You do not gain the benefits of your brawling die while wearing armor that gives you disadvantage on Stealth checks.

Spot Weakness

At 7th level, you can analyze your opponent’s movements and capitalize on mistakes. When a creature deals damage to you, you can use your reaction to gain advantage on the next attack you make against that creature.

In It to Win It

A small stroke of luck is all it takes to turn a fight around. Starting at 10th level, when you score a critical hit with a melee weapon attack, you regain the use of  your Second Wind.

Beware of Dog

At 10th level, your brawling die increases to a d6.

Bite Back

By 15th level, you have learned to fight with the desperate ferocity of a cornered animal. While you have less than half your maximum hit points, you can add your Constitution modifier to attack and damage rolls with melee weapons.

Go Down Swinging

Starting at 18th level, when you are reduced to 0 hit points but not killed outright, you can use your reaction to make one melee weapon attack with disadvantage against a target within range. If this attack hits, you are instead reduced to 1 hit point.

You can use this feature a number of times equal to your Constitution modifier and regain all uses after finishing a long rest.

Top Dog

At 18th level, your brawling die increases to a d8.