Oinoloth

Medium fiend (yugoloth), neutral evil
Armor Class 17 (natural armor)
Hit Points 126 (12d10 + 60)
Speed 40 ft.
STR
19 (+4)
DEX
17 (+3)
CON
18 (+4)
INT
17 (+3)
WIS
16 (+3)
CHA
19 (+4)
Saving Throws Con +8, Wis +7
Skills Deception +8, Intimidation +8, Perception +7
Damage Resistances cold, lire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities acid, poison
Condition Immunities poisoned
Senses blindsight 60 ft., darkvision 60 ft., passive Perception 17
Languages Abyssal, Infernal, telepathy 60 ft.
Challenge 12 (8400 XP)
Bringer of Plagues (Recharge 5–6).
Innate Spellcasting.
Magic Resistance.
Magic Weapons.
ACTIONS
Multiattack.
Claw.
Corrupted Healing (Recharge 6).
Teleport.
Transfixing Gaze.

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

Mordenkainen´s Tome of Foes
Oinoloth