Sources
CR
Type
Size
Alignment
Movement

Zuggtmoy

Large Fiend (demon), Chaotic Evil

Armor Class 18 (natural armor)
Hit Points 304 (32d10 + 128)
Speed 30 ft.
STR
22
+6
DEX
15
+2
CON
18
+4
INT
20
+5
WIS
19
+4
CHA
24
+7
Saving Throws DEX +9, CON +11, WIS +11
Skills Perception +11
Damage Resistances cold, fire, lightning
Damage Immunities poison; bludgeoning, piercing, slashing, that is nonmagical
Condition Immunities Charmed, Exhaustion, Frightened, Poisoned
Senses truesight 120 ft., passive Perception 21
Languages all, telepathy 120 ft.
Challenge 23 (50,000 XP)

Traits

Legendary Resistance (3/Day). If Zuggtmoy fails a saving throw, she can choose to succeed instead.

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

Spellcasting

Spellcasting. Zuggtmoy casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 22):

At will: detect magic, locate animals or plants

1/day each: etherealness, teleport

3/day each: dispel magic, entangle, plant growth

Actions

Multiattack. Zuggtmoy makes three Pseudopod attacks.

Pseudopod. Melee Weapon Attack: ++13 to hit, reach 10 ft., one target. Hit:15 (2d8 + 6) force damage plus 9 (2d8) poison damage.

Bonus Actions

Infestation Spores (3/Day). Zuggtmoy releases spores that burst out in a cloud that fills a 20-foot-radius sphere centered on her, and it lingers for 1 minute. Any creature in the cloud when it appears, or that enters it later, must make a DC 19 Constitution saving throw. On a successful save, the creature can't be infected by these spores for 24 hours. On a failed save, the creature is infected with a disease called the spores of Zuggtmoy, which lasts until the creature is cured of the disease or dies. While infected in this way, the creature can't be reinfected, and it must repeat the saving throw at the end of every 24 hours, ending the infection on a success. On a failure, the infected creature's body is slowly taken over by fungal growth, and after three such failed saves, the creature dies and is reanimated as a spore servant if it's a type of creature that can be.

Mind Control Spores (Recharge 5–6). Zuggtmoy releases spores that burst out in a cloud that fills a 20-foot-radius sphere centered on her, and it lingers for 1 minute. Humanoids and Beasts in the cloud when it appears, or that enter it later, must make a DC 19 Wisdom saving throw. On a successful save, a creature can't be infected by these spores for 24 hours. On a failed save, the creature is infected with a disease called the influence of Zuggtmoy for 24 hours. While infected in this way, the creature is charmed by her and can't be reinfected by these spores.

Reactions

Protective Thrall. When Zuggtmoy is hit by an attack roll, one creature within 10 feet of her that is charmed by her is hit by the attack instead.

Legendary Actions

Attack. Zuggtmoy makes one Pseudopod attack.

Exert Will. One creature charmed by Zuggtmoy that she can see must use its reaction, if a available, to move up to its speed as she directs or to make one weapon attack against a target that she designates.

Lore

The Demon Queen of Fungi, Lady of Rot and Decay, Zuggtmoy is an alien creature whose only desire is to infect the living with spores, transforming them into her mindless servants and, eventually, into decomposing hosts for the mushrooms, molds, and other fungi that she spawns.