Sanguinare

Unlike other Sorcerers, you discovered the secret to infusing your own body with magic; by using your own flesh & blood as catalyst. You unleash the raw, potential magic of blood to cast spells & bind those forces to your own body. Too radical for the polite society of wizardry, this magic is only studied by outsiders & animalistic cabals. 

Blood Magic

Utilize your own vitality against your foes. In addition to your Sorcery points, you can decrease your hit points in order to regain expended spell slots, at a ratio of 2 hit points per spell level. (For example, lose 2 hit points to regain a level 1 spell slot. Lose 18 hit points to regain a level 9 spell slot.) At level 6, you may also do the reverse; Spend an unused spell slot to regain 2 hit points per spell level of the spell slot spent. You can only spend or regain spell slots once per your turn, as a bonus action.

 

Gruesome Art

At level 6, you may spend 1 minute to perform a grisly ritual on any humanoid or beast corpses you find. After the activity is completed, you regain 1d4 hit points per corpse, one hour later. You may spend the resulting recovered hit points on an ally, instead of yourself, but the recipient must be chosen when the ritual begins. At level 14, the ritual becomes instantaneous.

 

Life Force

At level 14, Upon reaching 0 hit points, you may steal 1 hit point from another player character. That player has no way to prevent this from happening, although you cannot use this feature again until you make a long rest.

 

Thermoregulation

Your body becomes a magical instrument, maintained at peak physiological capability. At level 18, you gain resistance to poison damage & become immune to normal diseases. And you may add your Constitution modifier to both your Wisdom Saving Throws & your Spell Attack Bonus. Also, you no longer age.