Sources
CR
Type
Size
Alignment
Movement

Crokek'toeck

Gargantuan Fiend (demon), Chaotic Evil

Armor Class 15 (natural armor)
Hit Points 297 (17d20 + 119)
Speed 60 ft., swim 60 ft.
STR
28
+9
DEX
10
+0
CON
24
+7
INT
6
-2
WIS
10
+0
CHA
13
+1
Saving Throws CON +12, WIS +5
Damage Resistances cold, fire, lightning; bludgeoning, piercing, slashing, from nonmagical attacks
Damage Immunities poison
Condition Immunities Charmed, Frightened, Poisoned
Senses darkvision 120 ft., passive Perception 10
Languages understands Abyssal but can't speak
Challenge 14 (11,500 XP)

Traits

Amphibious. Crokek'toeck can breathe air and water.

Magic Resistance. Crokek'toeck has advantage on saving throws against spells and other magical effects.

Magic Weapons. Crokek'toeck's weapon attacks are magical.

Secure Memory. Crokek'toeck is immune to the waters of the River Styx as well as any effect that would steal or modify its memories or detect or read its thoughts.

Standing Leap. Crokek'toeck's long jump is up to 60 feet and its high jump is up to 30 feet, with or without a running start.

Actions

Bite. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit:44 (10d6 + 9) piercing damage.

Disgorge Allies (Recharge). Crokek'toeck opens its mouth and disgorges 1d4 barlguras, 3d6 gnolls led by 1 gnoll fang of Yeenoghu, 6d6 dretches, or 1d3 vrocks. Each creature it disgorges appears in an unoccupied space within 30 feet of Crokek'toeck's mouth, or the next closest unoccupied space.

Lore

Crokek'toeck is Yeenoghu's demonic pet. Resembling a giant mudskipper with the teeth, fur, ears, and laugh of a hyena, this unique demon can hold smaller demons in its gullet and disgorge them anywhere Yeenoghu wishes. Immune to the mind-shattering effects of the River Styx, Crokek'toeck is often used to transport smaller demons (and sometimes Yeenoghu himself) through the Styx's terrible waters.