monster

Sibriex

CR 18

Huge Fiend (demon), Chaotic Evil

Reveal Stat Block

Armor Class

19 (natural armor)

Hit Points

150 (12d12 + 72)

Speed

fly 20 ft. (hover)

str

dex

-4

con

int

wis

cha

Traits

Contamination.The sibriex emits an aura of corruption 30 feet in every direction. Plants that aren't creatures wither in the aura, and the ground in it is difficult terrain||3 for other creatures. Any creature that starts its turn in the aura must succeed on a 20 Constitution saving throw or take 14 (4d6) poison damage. A creature that succeeds on the save is immune to this sibriex's Contamination for 24 hours.

Legendary Resistance (3/Day).If the sibriex fails a saving throw, it can choose to succeed instead.

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

Actions

Multiattack.The sibriex uses Squirt Bile once and makes three attacks using its chain, bite, or both.

Chain.mw 6 to hit, reach 15 ft., one target. ({@damage 2d12 + 7) piercing damage.

Bite.mw 6 to hit, reach 5 ft., one target. ({@damage 2d8) piercing damage plus 9 (2d8) acid damage.

Squirt Bile.The sibriex targets one creature it can see within 120 feet of it. The target must succeed on a 20 Dexterity saving throw or take 35 (10d6) acid damage.

Warp Creature.The sibriex targets up to three creatures it can see within 120 feet of it. Each target must make a 20 Constitution saving throw. On a successful save, a creature becomes immune to this sibriex's Warp Creature. On a failed save, the target is poisoned, which causes it to also gain 1 level of exhaustion. While poisoned in this way, the target must repeat the saving throw at the start of each of its turns. Three successful saves against the poison end it, and ending the poison removes any levels of exhaustion caused by it. Each failed save causes the target to suffer another level of exhaustion. Once the target reaches 6 levels of exhaustion, it dies and instantly transforms into a living abyssal wretch|mtf under the sibriex's control. The transformation of the body can be undone only by a wish spell.

Legendary Actions.The creature can take 3 legendary actions...

Cast a Spell.The sibriex casts a spell.

Spray Bile.The sibriex uses Squirt Bile.

Warp (Costs 2 Actions).The sibriex uses Warp Creature.

Sibriex

No creature embodies the chaotic nature of the Abyss so well as the sibriex. Although the realm of the demons is already a place of infinite horrors, sibriexes for some reason make even more of these monstrosities.

Sibriex

Thought to be as old as the Abyss itself, sibriexes haunt remote parts of the plane, where they use their vile abilities to breed new horrors and apprehend forbidden lore. Rivulets of blood and bile cascade from a sibriex's body. Where these noxious fluids hit the ground, the land scape becomes polluted.

Keepers of Forbidden Lore

Sibriexes have spent eons amassing information from across the planes, hoarding knowledge for when it might be useful. Such is their incredible intellect that many seek them out, including demon lords. Some sibriexes act as advisors and oracles, manipulating demons into serving their ends, while other sibriexes cling to their secrets, parceling out lore only when doing so would advance their plans.

Demon Crafters

Sibriexes can channel the power of the Abyss to create new demons from other creatures. Over the course of days, they can create vast numbers of rutterkins to protect their lands and to ensure that the plane teems with destructive monsters. Some demons petition sibriexes for physical gifts, and if they are moved to do so, sibriexes can graft on new body parts to give the demons greater strength, vision, or stamina. Sibriexes never give aid freely; they demand a service or a treasure in return for the flesh-shaping they provide.