Alkilith

An alkilith is easily mistaken for some kind of foul fungal growth that appears on doorways, windows, and other portals. These dripping infestations conceal the demonic nature of the alkilith, making what should be a dire warning appear strange but otherwise innocuous. Wherever alkiliths take root, they weaken the fabric of reality, creating a portal through which even nastier demons can invade.
Symptoms of Doom. The appearance of an alkilith in the world heralds a great wrongness and an imminent catastrophe. An alkilith searches for an aperture such as a window or a door around which it can take root, stretching its body around the opening and anchoring itself with a sticky secretion. If left undisturbed, the opening becomes attuned to the Abyss and eventually becomes a portal to that plane.

Related Ethnicities

• Abyss Natives

Alkilith

Medium fiend, chaotic evil

Armor Class 17 (natural armor)

Hit Points 157 15d8+90

Speed 40ft

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STR

12 +1

DEX

19 +4

CON

22 +6

INT

6 -2

WIS

11 0

CHA

7 -2

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Saving Throws Dex +8, Con +10

Skills Stealth +8

Damage Resistances acid, cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks

Damage Immunities Poison

Condition Immunities charmed, frightened, poisoned

Senses darkvision 120 ft., passive Perception 10

Languages understands Abyssal but can't speak

Challenge 11

Amorphous. The alkilith can move through a space as narrow as 1 inch wide without squeezing.
False Appearance. While the alkilith is motionless, it is indistinguishable from an ordinary slime or fungus.
Foment Madness. Any creature that isn't a demon that starts its turn within 30 feet of the alkilith must succeed on a DC 18 Wisdom saving throw, or it hears a faint buzzing in its head for a moment and has disadvantage on its next attack roll, saving throw, or ability check.
If the saving throw against Foment Madness fails by 5 or more, the creature is instead subjected to the confusion spell for 1 minute (no concentration required by the alkilith). While under the effect of that confusion, the creature is immune to Foment Madness.
Magic Resistance. The alkilith has advantage on saving throws against spells and other magical effects.

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Actions

Multiattack. The alkilith makes three tentacle attacks.
Tentacle. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 18 (4d6 + 4) acid damage.