Colossus

Colossus fighters focus on channel pure brute strength, letting them lasts hours in a fight. They specialize in pushing through immense pain like nothing. Colossuses make great gladiators since they can prolong fights with their invincibility.

Shrug it Off / 3

You can shake off damage like it is nothing. Whenever you take damage, you can use your reaction to reduce that damage to 0. You can't use this feature again until you finish a long rest.

Can't Touch This / 3

While you are wearing heavy armor and a shield, enemies can't gain advantage on attack rolls against you. If two or more effects would give an enemy advantage on an attack rolls against you, they still gain advantage.

Determined Spirit / 7

Foes can't gravely harm you. While wearing heavy armor, whenever an enemy scores a critical hit on you, you may reduce the damage by your fighter level.

Crushing Parry / 10

Whenever a creature within 5 feet of you misses you with a melee attack, you can your reaction to force them to make a Strength saving throw or become prone. The DC is 8 + your proficiency bonus + your Constitution modifier. You can use this feature a number of times equal to your constitution modifier before finishing a long rest.

Protective Shielding / 15

Friendly creatures within 5 feet of get a +2 bonus to their armor class as long as your wearing armor or wielding a shield.

Invincible / 18

Whenever you would be dealt damage that would reduce you to 0 hit points, but not outright kill you, you go to 1 hit points instead, and you gain 1 level of exhaustion.