Grimlore's Grimoire
4-level Necromancy
You point at a creature within range, causing a dark green glow to pass over their body. The creature must make a Constitution saving throw or take 4d10 poison damage and become diseased; suffering disadvantage on all attack and skill checks for the duration as their skin begins to pustules all over their body. If the disease is not removed within 1 hour, the creature must make another Constitution saving throw or die. If a creature dies as the result of this spell, every creature within 10 feet must make a Constitution saving throw or become affected by this spell, as if it was initially cast on them. Constructs and undead are immune to the spell.