Path of the Titan (Barbaric Path) (5e Subclass)
From D&D Wiki
Titans are beings whom are far greater than any mortal. A Titan Barbarian seeks to become similar through attempting to make themselves invincible. As such, many do not even realize when they are stricken, as their nerves have grown numb to pain.
When you take this subclass at 3rd level, your body gains the capability to heal itself rapidly. While raging, at the end of your turn, you regain a number of hit points equal to the Rage Damage for your level, as seen on the barbarian table.
By 6th level, you have learned how to use an enemy's strike against them. While raging, when you are hit by a melee attack, you can use your reaction to make a melee weapon attack against the attacker. On a hit, you deal half the damage you took from that attack.
At 10th level, your body has hardened, and your mind has grown numb to pain. While raging, you have resistance to all damage.
Body Over Mind
At 14th level, you have gained the ability to ignore the effects of pain and injury. When you use your Rebound feature, you do not take damage from the triggering attack. Once you have used this feature twice, you must finish a long rest before you can use it again.