Goristro

Huge fiend (demon), chaotic evil
Armor Class 19 (natural armor)
Hit Points 310 (23d12 + 161)
Speed 40 ft.
STR
25 (+7)
DEX
11 (+0)
CON
25 (+7)
INT
6 (-2)
WIS
13 (+1)
CHA
14 (+2)
Saving Throws Str +13, Dex +6, Con +13, Wis +7
Skills Perception +7
Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 120 ft., passive Perception 17
Languages Abyssal
Challenge 17 (18000 XP)

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

Monster Manual
Goristro