Devourer

Large fiend, chaotic evil
Armor Class 16 (natural armor)
Hit Points 178 (17d10 + 85)
Speed 30 ft.
STR
20 (+5)
DEX
12 (+1)
CON
20 (+5)
INT
13 (+1)
WIS
10 (+0)
CHA
16 (+3)
Damage Resistances cold, fire, lightning
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 120 ft., passive Perception 10
Languages Abyssal, telepathy 120 ft.
Challenge 13 (10000 XP)

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

Volo´s Guide to Monsters
Devourer