Coral Behemoth

Amphibious. The coral behemoth can breath both air and water.

Natural Camoflauge. While the coral behemoth is not moving, it is indistinguishable from a naturally occuring coral reef.

Multiattack. The coral behemoths makes two slam attacks and one polyp attack as an action.

Slam. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 31 (4d10 + 9) bludgeoning damage. 

Polyp. RangedWeapon Attack: +11 to hit, range 60/120 ft., one target. Hit: 19 (3d12) acid damage.

Current Blast (Recharge 5-6). As an action the coral behemoth projects a 10ft by 60 ft line of pressurized water. Any creature in the area must succeed on a DC: 19 Strength saving throw. On a failed save, an affected creature takes 10d8 bludgeoning damage. is pushed 30 ft away, and knocked prone. On a successful save, an affected creature take hald damage and is not knocked prone or pushed.

Undertoe. While submerged, the coral behemoth can use it's bonus action to draw the surrouding water into itself. Any creature caught in a 30 ft cone in front of the creature while it performs this action must succeed on a DC: 19 Strength saving throw. On a failed save, an affected creature is moved 20 ft closer to the front of the coral behemoth. On a successful save a creature is unaffected by the pull.

Anemonae Sting. As a reaction to being hit with a melee attack, the coral behemoth can force the attacking creature to make a DC: 19 Constitution saving throw. On a failed save the creature becomes paralyzed until the end of the coral behemoth's next round. A creature who is resistant to the poisoned condition has advantage on the saving throw and creatures immune to the poisoned condition automatically succeeds on the saving throw.