Homebrew (updated older edition)
4-level Necromancy
You open a wound on your body, shooting out a thread of blood between yourself and a creature within range. As you cast the spell, you must expend a number of hit points. The creature must then succeed on a Dexterity saving throw or take 8d6 + the number of hit points spent as necrotic damage. If this damage brings the target to 0 hit points, the hit point cost is refunded as blood drains through the thread back into your body.
When you cast this spell using a spell slot of 5th-level or higher, the damage increases by 2d6 for each slot level above 4th.
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