Poolhusk (5e Creature)
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Medium undead, neutral evil
Icy Forditude. If the poolhusk is exposed to cold damage, it takes no damage and its skin freezes, giving it a +2 to AC until the end of its next turn.
Stench. Any creature that starts its turn within 5 feet of the poolhusk must succeed on a DC 10 Constitution saving throw or be poisoned until the start of its next turn. On a successful saving throw, the creature is immune to the poolhusk's Stench for 24 hours.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 2) piercing damage + 3 (1d6) poison damage.
Brackish Blast (Recharge 6). The poolhusk vomits tainted water in a 10-ft. cone. Every creature in that area must make a DC 15 Constitution saving throw, taking 14 (3d8) bludgeoning damage + 8 (2d8) poison damage on a failed save, or half as much on a successful one.
Born of a combination of necromancy and elemental magic, a poolhusk can only be created from the corpse of a humanoid that drowned. Its horrid skin is grown partially over by algae and scum, and its eyes are as inky as the deepest oceans. Water perpetually flows from its orifices. The scent of briny carrion overwhelms all who approach a poolhusk. These undead creatures can spew out gushing volleys of poisoned saltwater to blast away foes.
Undead Nature. A poolhusk doesn't require food, drink, air, or sleep.