Remorhaz

Huge Monstrosity, Unaligned

AC 17     Initiative +5 (15)
HP 195 (17d12 + 85)
Speed 40 ft., Burrow 30 ft.

Ability Scores
STR 24 (+7) Save +7    DEX 13 (+1) Save +1    CON 21 (+5) Save +5
INT 4 (−3) Save −3    WIS 10 (+0) Save +0    CHA 5 (−3) Save −3

Damage Immunities Cold, Fire
Senses Darkvision 60 ft., Tremorsense 60 ft.; Passive Perception 10
Languages —
CR 11 (XP 7,200; PB +4)

Traits

• Heat Aura. At the end of each of the remorhaz’s turns, each creature in a 5-foot emanation originating from the remorhaz takes 16 (3d10) Fire damage.

Actions

• Bite. Melee Attack Roll: +11, reach 10 ft.
  Hit: 18 (2d10 + 7) Piercing damage plus 14 (4d6) Fire damage. If the target is a Large or smaller creature, it is Grappled (escape DC 17) and Restrained until the grapple ends.

Bonus Actions

• Swallow. Strength Saving Throw: DC 19, one Large or smaller creature Grappled by the remorhaz.
  Failure: The creature is swallowed and the Grappled condition ends. A swallowed creature is Blinded and Restrained, has Total Cover from effects outside the remorhaz, and takes 10 (3d6) Acid damage plus 10 (3d6) Fire damage at the start of each of the remorhaz’s turns.
  
  If the remorhaz takes 30 or more damage in a single turn from a creature inside it, it must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures. Regurgitated creatures land Prone in a space within 5 feet of the remorhaz.
  
  If the remorhaz dies, swallowed creatures are no longer Restrained and can escape using 15 feet of movement, exiting Prone.