Death Cloud

     In a land where corpses are destroyed or used, some ghosts assume gaseous forms. Mix people dying, toxic miasma, necromantic energy and fel contamination over thousands of square kilometers. Let it fester over hundreds of years. Things like the death cloud happen. These concentrations of yellow miasma, rot-like stench and ashes acquire a will of their own that seeks to consume the breath of living beings. Be it dogs, people or alligators, the death cloud tries to squeeze inside the respiratory system of creatures. Internal caustic burns lead to death, creating a cadaver that the cloud manipulates like a puppet and tries to act according to the fragments of memories of its past life. This results in scenes like a mule with a rotten and yellow breath entering a tavern and moaning to the owner, or a soldier with wounds leaking a yellow-red paste trying to pay for something with imaginary coins. When the corrosion inevitably destroys the host, the death cloud seeks another. These entities are found throughout the planet, taken by high altitude winds. the good news is that fire can destroy a death cloud, be it in its gaseous form or inside a body.

 

Death Cloud

Large undead, any alignment

---

Armor Class 15
Hit Points 55 (10d10)
Speed 0 ft., fly 40 ft.

---

STR	DEX	CON	INT	WIS	CHA
8 (-1)	13 (+1)	10 (+0)	10 (+0)	15 (+2)	8 (-1)

---

Damage Resistances acid, lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities cold, necrotic, poison
Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained
Senses darkvision 60 ft., passive Perception 12
Languages any languages it knew in life
Challenge 7

---

• Air Form. The death cloud can enter a hostile creature's space and stop there. It can move through a space as narrow as 1 inch wide without squeezing.

ACTIONS

1. Miasma. Each creature in the death cloud's space must make must succeed on a DC 15 Constitution saving throw or become poisoned. While poisoned in this way, a target takes 22 (4d10) acid 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.
2. Possession. One humanoid that the death cloud can see within 5 feet of it must succeed on a DC 13 Constitution saving throw or be possessed by it; the death cloud then disappears, and the target is incapacitated and loses control of its body. The death cloud now controls the body but doesn't deprive the target of awareness. The death cloud can't be targeted by any attack, spell, or other effect, except ones that turn undead, and it retains its alignment, Intelligence, Wisdom, Charisma, and immunity to being charmed and frightened. It otherwise uses the possessed target's statistics, but doesn't gain access to the target's knowledge, class features, or proficiencies. The possession lasts until the body drops to 0 hit points or the death cloud is turned or forced out by an effect like the dispel evil and good spell. When the possession ends, the death cloud reappears in an unoccupied space within 10 feet of the body. The target is immune to this cloud's Possession for 24 hours after succeeding on the saving throw or after the possession ends.