based on D&D 5th Edition
Remorhaz
Huge  Monstrosity , Unaligned

Armor Class 17  (natural)
Hit Points 195  (17d12+85)
Speed 30 ft. , burrow 20 ft. , swim 15 ft.



STR DEX CON INT WIS CHA
24  (+7) 13  (+1) 21  (+5) 4  (-3) 10  (0) 5  (-3)
Damage Immunities Fire, Frost
Senses tremorsense,darkvision, passive Perception 10
Languages
Challenge 11  (0 XP)
Heated Body. An adjacent creature that touches or hits with a melee attack takes 10 (3d6) fire damage..
Actions
Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 40 (6d10 +7) piercing damage.
Bite+. Target must make DC 17 dexterity saving throw or be grappled, for 10 (3d6) fire damage in ft. Melee
Swallow. One grappled creature, target must make DC 17 dexterity saving throw or be swallowed, if size medium or smaller. While inside blinded, restrained, and total cover from outside attacks. Suffers 21 (6d6) acid damage at start of turn. If damage taken by worm is 30 or more on a single turn the creature must make a DC 15 Constitution saving throw or regurgitate swallowed creatures. in Melee