Amnizu (5.5)

Medium Fiend (Devil), Typically Lawful Evil
Armor Class 21 (natural armor)
Hit Points 202 (27d8 + 81)
Speed 30 ft., fly 40 ft.
STR
11 (+0)
DEX
13 (+1)
CON
16 (+3)
INT
20 (+5)
WIS
12 (+1)
CHA
18 (+4)
Saving Throws Dex +7, Con +9, Wis +7, Cha +10
Skills Perception +7
Damage Resistances cold; bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered
Damage Immunities fire, poison
Condition Immunities charmed, poisoned
Senses darkvision 120 ft., passive Perception 17
Languages Common, Infernal, telepathy 1,000 ft.
Challenge 18 (20000 XP)     Proficiency Bonus +6
Devil's Sight.
Magic Resistance.
ACTIONS
Multiattack.
Taskmaster Whip.
Blinding Rot.
Forgetfulness (Recharge 6).
Spellcasting.
REACTIONS
Instinctive Charm.

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

Monsters of the Multiverse
Amnizu (5.5)