Circle of Death

6th-Level Necromancy Spell (Sorcerer, Warlock, Wizard)

Casting Time: Action
Range: 150 feet
Components: V, S, M (the powder of a crushed black pearl worth at least 500 gold)
Duration: Instantaneous

A sphere of negative energy ripples out in a 60-foot radius sphere from a point within range. Each creature in that area must make a Constitution saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.

At Higher Levels: When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d6 for each slot level above 6th.

Source: Player's Handbook, p. 221