Thanatos's Creed

A sphere of unbridled critical energies of hell violently bursts where you can see within range. Each creature in a 40-foot-radius sphere centered on the point you choose must make a Dexterity saving throw. The sphere spreads around corners. A creature takes 20d6 necrotic damage and 20d6 force damage on a failed save, or half as much damage on a successful one. On a failed save the target's constitution score is reduced by 1d12, the target dies if this reduces its Constitution to 0. Otherwise, the reduction lasts until the target finishes a short or long rest.

If a non-evil humanoid dies from this attack, the corpse revives as a zombie 1d4 hours later.