Blood Disgorge

You touch one willing creature and imbue it with the power to spew blood or the equivalent humor from its mouth, provided it has one. Until the spell ends, the creature can use an action to vomit blood in a 15-foot cone in a manner akin to a nosferatu. Each creature in that area must make a Constitution saving throw. On a failed save, a creature takes 18 (4d8) necrotic damage, and it can’t regain hit points for 1 minute. On a successful save, the creature takes half as much damage with no additional effects.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 4 (1d8) for each slot level above 3rd.