Brutes are simple warriors who rely on mighty attacks and their own durability to overcome their enemies. Some brutes combine this physical might with tactical cunning. Others just hit things until those things stop hitting back.

Source: Unearthed Arcana 46 - Three Subclasses

Brute Force

Starting at 3rd level, you’re able to strike with your weapons with especially brutal force. Whenever you hit with a weapon that you’re proficient with and deal damage, the weapon’s damage increases by an amount based on your level in this class, as shown on the Brute Bonus Damage table.

Brute Bonus Damage
Fighter Level Damage Increase
3rd 1d4
10th 1d6
16th 1d8
20th 1d10

Brutish Durability

Beginning at 7th level, your toughness allows you to shrug off assaults that would devastate others.

Whenever you make a saving throw, roll 1d6 and add the die to your saving throw total. If applying this bonus to a death saving throw increases the total to 20 or higher, you gain the benefits of rolling a 20 on the d20.

Additional Fighting Style

At 10th level, you can choose a second option from the Fighting Style class feature.

Devastating Critical

Starting at 15th level, when you score a critical hit with a weapon attack, you gain a bonus to that weapon’s damage roll equal to your level in this class.

Survivor

At 18th level, you attain the pinnacle of resilience in battle. At the start of each of your turns in combat, you regain hit points equal to 5 + your Constitution modifier (minimum of 1 hit point). You don’t gain this benefit if you have 0 hit points or if you have more than half of your hit points left.