Sibriex

Huge Fiend (Demon), typically Chaotic Evil
Armor Class 19 (natural armor)
Hit Points 150 (12d12 + 72)
Speed 0 ft., fly 20 ft. (hover)
STR
10 (+0)
DEX
3 (-4)
CON
23 (+6)
INT
25 (+7)
WIS
24 (+7)
CHA
25 (+7)
Saving Throws Int +13, Cha +13
Skills Arcana +13, History +13, Perception +13
Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities poisoned
Senses truesight 120 ft., passive Perception 23
Languages all, telepathy 120 ft.
Challenge 18 (20000 XP)     Proficiency Bonus +6
Contamination.
Legendary Resistance (3/Day).
Magic Resistance.
Actions
Multiattack.
Chain.
Spellcasting.
Squirt Bile.
Warp Creature.
Legendary actions
Cast a Spell.
Spray Bile.
Warp (Costs 2 Actions).

This full creature's stat block is not available (not OGL).

Monsters of the Multiverse
Sibriex