Tides of Blood

3rd-level necromancy (hemomancy)

Casting Time: 1 action

Range: Self (20-foot radius)

Components: V, S

Duration: 1 round

You draw out your own blood as well as the blood of corpses within 20 feet of you. You may choose to spend a number of hit points, and you may also gain the hit points needed from corpses within the radius, not including those of constructs, elementals, and undead. Each corpse that had a hit point maximum greater than or equal to 5 in life gives 5 hit points towards the casting, and then cannot be used to cast this spell again.

As a bonus action on your next turn, you can release the blood. Each creature within 20 feet of you must make a Dexterity saving throw. On a failed save, they take 4d6 + the number of hit points gained or spent as necrotic damage. On a successful save, they take half as much damage.

When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.