Dark Heart Extraction

You plunge your hand or focus of magic into a creature’s chest and rip free a glowing manifestation of its heart—soulbound and beating. The creature must make a Constitution saving throw. On a failed save, their heart is magically extracted, and they are paralyzed for 1 round and then charmed by you for the duration. On a successful save, they take 6d8 necrotic damage, but their heart remains intact.

While holding the extracted heart that if they failed the save:

• The target is under your magical influence. You can use your bonus action each round to command them telepathically as if under the suggestion spell (no additional saves).

• If you crush the heart (no action required), the target takes 10d10 necrotic damage. If this reduces them to 0 HP, their body is immediately petrified into obsidian ash, and only true resurrection or wish can bring them back.

• If you release or return the heart (ending concentration early), the creature is freed from your control and suffers one level of exhaustion.

At Higher Levels.
When you cast this spell using a spell slot of 6th level or higher, the necrotic damage on a failed save increases by 1d8 for each slot level above 5th, and the damage for crushing the heart increases by 2d10 per level.