Drowned Assassin

Drowned Assassin
The drowned assassin stalks and kills in a grim pantomime of its former occupation. Sneaking from shadow to shadow, and appearing in the undead assault of Tammeraut's Fate, it aims its barnacle-encrusted hand crossbow with deadly precision. Hidden behind a simple driftwood mask, this creature's face causes terror in mortal hearts when exposed.
Bluerot
This disease targets humanoids. While afflicted with bluerot, a victim grows grotesque blue boils on their face and back. This disease is carried by undead (including the drowned ones in Tammeraut's Fate), and victims most often acquire it through wounds caused by infected creatures. The disease's boils manifest in 1d4 hours, causing the victim's Constitution and Charisma scores to decrease by 1d4 each, to a minimum of 3. This is quickly followed by a fever and tingling in the extremities. An infected creature is vulnerable to radiant damage and gains the ability to breathe underwater.
At the end of each long rest, an infected creature makes a 12 Constitution saving throw. On a success, the victim regains 1 point of Constitution and 1 point of Charisma lost to the disease. If the infected creature regains all the points lost to the disease, it is cured. Other effects that raise the victim's ability scores do not cure the disease. On a failed saving throw, the victim takes 18 (4d8) necrotic damage as the boils burst and spread. A creature reduced to 0 hit points by this damage cannot regain hit points until the disease is cured, though it can be stabilized as normal.