Harm

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 min 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.