Naath-Tryst

You twist a creature’s body and soul into a conduit of pure torment. Choose one creature within range. The target must make a Constitution saving throw. On a failure, it takes 15d6 necrotic damage and 10d6 psychic damage, is incapacitated, and emits an aura of despair in a 30-foot radius. All creatures in the aura must succeed on a Wisdom saving throw at the start of their turn or take 8d8 psychic damage and become frightened for 1 minute. If the target dies, its body erupts in a 60-foot explosion, dealing 12d12 necrotic damage and 12d12 lightning damage to all within range. On a success, the target takes half damage and suffers disadvantage on all attack rolls, saving throws, and ability checks for the duration. If they survive, they are permanently cursed, unable to benefit from healing magic short of a Wish spell.