V, S, M (The powder of a crushed black pearl worth at least 500 gp)
Duration
Instantaneous
School
Necromancy
Level
6
Saving throw
Constitution
Damage type
Necrotic
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.
Circle of Death damage by spell slot level
Spell slot level
Damage
Average
6th
8d6 necrotic
28
7th
10d6 necrotic
35
8th
12d6 necrotic
42
9th
14d6 necrotic
49
Averages are the dice’s expected total. A target that succeeds on its Constitution save takes half. Roll any row in the dice roller.
The 2024 Player’s Handbook revised many spells, and the SRD 5.2 carries the new text. What changed from the 2014 version above:
Dice in the main effect: 8d6 → 8d8.
Casting time
Action
Range
150 feet
Components
V, S, M (the powder of a crushed black, pearl worth 500+ GP)
Duration
Instantaneous
School
Necromancy
Level
6
Classes
Sorcerer, Warlock, Wizard
Negative energy ripples out in a 60-foot-radius Sphere from a point you choose within range. Each creature in that area makes a Constitution saving throw, taking 8d8 Necrotic damage on a failed save or half as much damage on a successful one.
Using a Higher-Level Spell Slot. The damage increases by 2d8 for each spell slot level above 6.
2024 version from the SRD 5.2. Most tables settle on one edition, so check which one yours uses.