Harm
level 6 - necromancy
Casting Time: 1 action
Range: 60 feet
Components: V, S
Duration: Instantaneous
You unleash a virulent disease on a creature that you can see within range. The target must make a Constitution saving throw. On a failed save, it takes 14d6 necrotic damage, or half as much damage on a successful save. The damage can't reduce the target's hit points below 1. If the target fails the saving throw, its hit point maximum is reduced for 1 hour by an amount equal to the necrotic damage it took. Any effect that removes a disease allows a creature's hit point maximum to return to normal before that time passes.
Cleric
Player´s Handbook (SRD)
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DnD 5e Spells › Harm