You target a corpse, or any undead that you can see and that is under your control; you force dark energy to erupt from inside of the undead. (The undead must be under your command, otherwise the spell slot is wasted.) [The spell destroys the undead you target, and they cannot be resurrected/reanimated, without the aid of the Wish spell or True Resurrection]
Targeting/AOE:
When you target this corpse/undead, the body burns with dark purple and black necrotic energy that quickly erupts from the body. The explosion envelopes a 10ft radius, and ignores half and three-quarters cover, but does not effect creatures in full cover from the explosion.
Damage:
Creatures and objects caught within the blast make a Constitution saving throw, or take 4D8 Necrotic Damage and are blinded until the end of your next turn. Creatures that succeed on their Constitution Saving Throw take half damage and are not blinded. Undead and Constructs caught in the blast take half damage, or none on a successful saving throw. Non-magical plant life in the area is desiccated, while Magical Plants and Plantlike creatures have disadvantage on the saving throw.
Upcasting:
You may target one additional corpse/undead with the spell for each spell slot of 4th level or higher.
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