Sources
CR
Type
Size
Alignment
Movement

Pestilence Demon

Large Fiend (demon), Chaotic Evil

Armor Class 15 (natural armor)
Hit Points 104 (11d10 + 44)
Speed 40 ft., fly 60 ft.
STR
17
+3
DEX
15
+2
CON
18
+4
INT
8
-1
WIS
13
+1
CHA
8
-1
Saving Throws DEX +5, WIS +4, CHA +2
Damage Resistances cold, fire, lightning; bludgeoning, piercing, slashing, from nonmagical attacks
Damage Immunities poison
Condition Immunities Poisoned
Senses darkvision 120 ft., passive Perception 11
Languages Abyssal, telepathy 120 ft.
Challenge 6 (2,300 XP)

Traits

Magic Resistance. The demon has advantage on saving throws against spells and other magical effects.

Actions

Multiattack. The demon makes two attacks: one with its beak and one with its talons.

Beak. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:10 (2d6 + 3) piercing damage.

Talons. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:14 (2d10 + 3) slashing damage.

Spores (Recharge). A 15-foot-radius cloud of toxic spores extends out from the demon. The spores spread around corners. Each creature in that area must succeed on a DC 14 Constitution saving throw or become poisoned. While poisoned in this way, a target takes 5 (1d10) poison damage at the start of each of its turns. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Emptying a vial of holy water on the target also ends the effect on it.

Stunning Screech (1/Day). The demon emits a horrific screech. Each creature within 20 feet of it that can hear it and that isn't a demon must succeed on a DC 14 Constitution saving throw or be stunned until the end of the demon's next turn.

Lore

The dark reflections of angels, demons are the incarnation of black mana and all it represents—selfish desire and lust for power. Their forms are roughly humanoid, but distorted and bestial. Their grotesque heads feature elongated ears, spiky protrusions, and large horns. (The size and number of a demon's horns are an indication of its age and power.) Spikes protrude from their backs and arms, and their hands are warped into large, sharp claws. Most demons have large, leathery wings, and a few…