Martial Artist

You choose to cast aside all weapons and shields and train your body beyond its limits to be the strongest warrior there is. 

Unarmed Fighting

When you choose this archetype at 3rd level, you gain the following benefits while unarmed and you aren't wielding a shield:

• Your unarmed strikes uses a d6 for damage. This damage increases to a d8 at level 9, to a d10 at level 14, and to a d12 at level 18.
• When you use the Attack action with an unarmed strike, you can make one unarmed strike as a bonus action.
• When an enemy you can see attacks you, whether its a hit or miss, you can use your reaction to make an unarmed strike against that enemy if they are within range and you aren't incapacitated.

See Through Their Defenses

You focus on your opponent, looking for any openings they might have.

Starting at 7th level, when you hit a creature with an unarmed strike, starting on your next turn, any unarmed strike made against that creature now has advantage. You lose advantage if you attack another creature. 

Unarmored Fighting

At 10th level, when not wearing any armor or wielding a shield, your AC is 10 + your Dexterity modifier + your Strength modifier. Your speed also increases by 10 feet.

True Strike

At 15th level, you can add your proficiency bonus to the damage rolls of your unarmed strikes. Your unarmed strikes count as magical for the purpose of overcoming resistance and immunity. 

Undying Spirit

At 18th level, at the start of each of your turns, you regain hit points equal to half your fighter level (rounded down) if you have no more than half your max hit points. You don't gain this benefit if you have 0 hit points.