Iumenta Pox

It takes 1d4 days for iumenta pox’s symptoms to appear
in an infected humanoid. A creature with iumenta pox has
trouble breathing, and its skin erupts with painful green boils
that ooze pus. As the disease progresses, these pustules turn
black.
At the end of each long rest, an infected creature must
succeed on a DC 13 Constitution saving throw or take 7 (2d6)
necrotic damage. The creature’s hp maximum is reduced by
an amount equal to the damage taken. This reduction lasts
until the disease is cured. The target dies if this effect reduces
its hp maximum to 0. When an infected creature dies, its
corpse rises as a mold zombie 1d4 hours after death. Iumenta
pox can be cured with two successful saving throws.