Sanguimancer

A wizard that uses blood magic to drain his foes vitality and bolster his own.

Crimson Blessing

You gain additional hit points equal to your level.

Grim Harvest

At 2nd level, you gain the ability to reap life energy from creatures you kill with your spells. Once per turn when you kill one or more creatures with a spell of 1st level or higher, you regain hit points equal to twice the spell’s level, or three times its level if the spell belongs to the School of Necromancy. You don’t gain this benefit for killing constructs or undead.

Vital trade offs

At 6th level you may spend HP instead of spell slots. You may cast a spell by trading twice the spells level in HP.

Flowing Life Force

When you reach level 10 you may expend any amount of life when casting a damaging spell to increase the damage of that spell by half the amount of life spent. Additionally when you damage a creature with a spell, you may regain hit points equal to half the damage dealt rounded down, you may use this feature a number of times equal to your proficiency bonus per long rest.

Sanguine Puppeteer

At 14th level, once per long rest you may use an action to take control of one of your foes. You may target a creature size large or smaller, they must succeed on a spell saving throw or you control them during their turn, a large creature has advantage on this saving throw. The effect lasts for one minute. While using this ability you can't concentrate on other spells but otherwise may cast normally. As an action on your turn you may end the ability early and pull the blood from the targets body dealing 12d8 force damage. Undead, constructs and elementals cannot be targeted by this effect.