Remorhaz

Huge monstrosity, unaligned

Armor Class 17 (natural armor)

Hit Points 195 (17d12+85)

Speed 30ft., burrow 20ft.

Damage Immunities cold, fire

Senses darkvision 60ft., tremorsense 60ft., passive Perception 10

Languages -

Challenge 11 (7,200 XP)

Traits

Heated Body

A creature that touches the remorhaz or hits it with a melee attack while within 5ft of it takes 10 (3d6) fire damage.

Actions

Bite

Melee Weapon Attack: +11 to hit, reach 10ft., one target.
Hit: 40 (6d10+7) piercing damage plus 10 (3d6) fire damage. If the target is a creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the remorhaz can't bite another target.

Swallow

The remorhaz makes one bite attack against a Medium or smaller creature it is grappling. If the attack hits, that creature takes the bite's damage and is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the remorhaz, and it takes 21 (6d6) acid damage at the start of each of the remorhaz's turns.

If the remorhaz takes 30 damage or more on a single turn from a creature inside it, the remorhaz must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10ft of the remorhaz. If the remorhaz dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15ft of movement, exiting prone.