Deep Magic Volume 1
Keening Wail
4-level Necromancy
Casting Time: 1 action
Range/Area: Self
Components: Verbal, Somatic, Material
Materials: a ringed lock of hair from an undead creature
Duration: Instant
Attack/Save: CON Save
Damage/Effect: Necrotic
You emit an unholy shriek from beyond the grave. Each creature in a 15-foot cone must make a Constitution saving throw. A creature takes 6d6 necrotic damage on a failed save, or half as much damage on a successful one. If a creature with 50 hit points or fewer fails the saving throw by 5 or more, it is instead reduced to 0 hit points. This wail has no effect on constructs and undead.
At higher levels: When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.
Available for: Bard, Cleric, Warlock