Crabulan

Amphibious. The crabulan can breathe air and water.

Steam.  The crabulan have an internal flame that they can use to heat water and create steam.  This, and their thick outer shell, gives them resistance to any fire or heat based damage.  They are susceptible to cold based damage however.

Hidden Attack.  In shallow water and sand, crabulans are able to partially bury themselves in the sand and hide.  Hidden in this way, they can surprise and get a free attack on any single creature that comes into their reach.

Claw. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 +4 ) bludgeoning damage, and the target is grappled until they use an action to free themselves (Strength escape DC 16). The crab has two claws, each of which can grapple only one target.  Each round a target is grappled, they take an additional 3d6+4 damage.

Steam. The crabulan is capable of spraying a steam from its mouth covering a 30 feet cone. Damage suffered is 15 (3d10) and will be blinded until the beginning of the crabulan's next turn.  Any creature in the cone must make a Dexterity Save (DC 14).  A successful save grants half damage, and no blindness.  The crabulan is capable of expressing its steam attack every other round.