Bound Water Elemental - Dog

Evaporative Fatigue. If the elemental is in an area of extreme heat or is hit by an attack that deals 10 or more Fire damage, its body begins to desiccate. Its Speed is decreased by 20 feet until the end of its next turn.

Fluid Physiology. The elemental has advantage on ability checks and saving throws made to escape a Grapple or the Restrained condition. Additionally, it can move through a space as narrow as 1 foot wide without squeezing.

Loyal Current. As a Reaction, when a creature the elemental is loyal to within 5 feet is hit by an attack, the elemental can interpose its watery body. The elemental takes the damage instead of the loyal creature.

Multiattack. The elemental makes two attacks, one Slam and one Bite.

Slam. Melee Attack Roll: +7, reach 5 ft. Hit: 13 (2d8 + 4) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Prone condition.

Bite. Melee Attack Roll: +7, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage plus 3 (1d6) cold damage. The elemental’s jaws unhinge like a cresting wave, snapping shut with the force of a hydraulic press. Instead of solid teeth, the target is punctured by jagged, high-pressure needles of frozen brine that dissolve into the wound, chilling the blood.

Tidal Tackle (Recharge 4–6). The elemental moves up to its speed in a straight line. During this move, it can enter the spaces of Large or smaller creatures. Each creature whose space it enters must succeed on a DC 15 Strength Saving Throw. On a failure, a creature takes 13 (2d8+4) bludgeoning damage and is knocked Prone. On a success, the creature takes half damage and isn't knocked prone.