Path of the Wicked Grin

Using unsettling levels of sadomasochism your rage turns to into temporary bursts of damage. Or your rage can be channeled into fits of pleasure, rendering attacks against you less effective.

Morbid Glee

At 3rd level, Your rage turns into a fit of Sadomasochism. Every time you take damage that and that damage is to normal Hit Points you gain a +1 to your Rage Damage. This extra rage damage lasts as long as you are raging, and you can not gain more Rage Damage than your barbarian level.

Additionally, When you hit a creature with an attack while raging, you may forgo the Rage Damage to gain your Rage Damage as Temporary Hit Points. These temporary hit points last until your rage ends.

At 14th level and onward, Your Rage Damage can exceed your level.

Will of the Dominate

Starting at level 6, you gain resistance to psychic damage while raging. While raging you can change the damage type of your Rage Damage to psychic.

Enthralling Furry

Beginning at 10th level, when you deal damage using your Rage Damage the brutal sight is painful to watch but difficult to look away from. Any creature that is able to see you must make a Wisdom saving throw (DC equal to Rage Damage + your proficiency bonus + your Charisma modifier). On a failed save a creature takes psychic damage equal to your Rage Damage, and has disadvantage on their next attack against you. On a successful save, a creature only takes half as much damage.

Smiling Pain Engine

Starting at 14th level, your joy of pain raises to that of unsightly levels. While raging when you suffer a critical hit, if you survive, you may use your reaction to move up to 15 feet and make an attack at disadvantage. If this attack hits treat it as a critical hit.

While raging when you land a critical hit double your Rage Damage. This increase lasts until you end your turn without dealing damage.