You trace a rotting rune in the air and whisper the will of Eldrith Mortalis.
One creature of your choice that you can see within 30 feet must make a Constitution saving throw (DC 13).
On a failed save, the creature takes 8d8 necrotic damage. On a success, it takes half as much damage.

Plant creatures or nature-based forms (druids in wild shape, summoned animals, etc.) have disadvantage on the saving throw and do not halve the damage on a success.

This spell can be cast only once per long rest as a boon granted by Eldrith Mortalis.