Vampiric Thrall

A Vampiric Thrall, a powerful Barbarian given the powers of a cursed vampire when entering their enraged state. Their connection with this Vampiric nature makes them deeply powerful when activated. 

Level 3: Consumption

Your Vampiric powers begin to reveal itself. You gain the natural ability of climb speed equal your walking speed, this climbing also does not require your hands. Additionally you can feel vampiric fangs reveal themselves in your jaw. You gain a bonus action attack with your new unarmed attack fangs. The Fangs do 1d4 Piercing + 1d12 Necrotic damage. The creature heals equal the damage they inflict from the Necrotic. While in Rage, your vampiric nature allows you consume the essence of slain creature to empower yourself. You gain 8 + proficiency bonus + constitution modifier in temporary hit points every time you kill a creature that isn't an undead or construct.

Level 6: Regenerative Rage

You vampiric blood boils when you enter a enraged state. While you are in rage, you gain regeneration. At the start of your turn while in rage or when you use a bonus action to enter rage, you heal hit points equal to 5 + proficiency bonus + constitution modifier. The healing can be disabled for one turn by taking Radiant damage.

Level 10: Eviscerate

Your ruthless desires release, as you submit to your blood lust in the moment of your slaughter. If you kill someone using a melee weapon attack you can choose to eviscerate the target. You rip the target limb from limb. Any number of creatures that can see you performing this must make a Wisdom saving throw with a DC of 8 + proficiency bonus + Strength modifier, on a failed save a creature is frightened. At the end of their turns they can repeat the saving throw to remove the frighten condition or move out of line of sight. Your act of obscene violence grants you an unnatural vigor, spend and roll up to two hit dice + your constitution modifier and gain temporary hit points equal your roll. You can use this trait number of times equal your proficiency in a day and it recharges after a long rest. You gain the ability to expend three hit dice at level 12.

Level 14: Eternal Anger

The blood boiling in you allows you to learn the ultimate ways to brutalize your enemies. While in Rage, your thrall powers reveal themselves. While in rage, now when receiving damage, you can choose to have half the damage to lower your maximum hit points. You gain a damage bonus to your Rage bonus equal the maximum hit points missing. Once the rage is over, their maximum hit points is restored and the rage bonus is reset.