Plague Doctor (5e Creature)
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Medium humanoid (any race), any alignment
Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Acidic Vial (3/Day). The plague doctor hurls a vial of acid at a point it can see within 60 feet of it. Each creature in a 10-foot-radius sphere centered on that point must make a DC 12 Dexterity saving throw. On a failed save, a creature takes 10 (3d6) acid damage and nonmagical armor worn by the target is partly dissolved and takes a permanent and cumulative -1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10. On a successful save, a creature takes half as much damage and its armor isn't dissolved.
Pyrosiphon (Recharge 5-6). The plague doctor sprays burning liquid in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 10 (3d6) fire damage on a failed save or half as much damage on a successful one.
Plague doctors are specialists from the apothecary school to torch and dissolve corpses and undead in the infected regions of the city. Their weapons are also deadly against armored enemies. They are considered somewhat strange and have an unhealthy sense of humor. Many plague doctors are said to be badly mutilated by leprosy and therefore enjoy inflicting agony on both the undead and the living alike. Plague doctors carry a pyrosiphon and some acidic vials which heroes can collect and use as weapons.