Poolhusk Frostborn (5e Creature)
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Medium undead, neutral evil
Damage Resistances Piercing, slashing, and bludgeoning from nonmagical attacks not made with silver weapons, fire, necrotic
Frozen Body. The poolhusk's melee attacks deal 2d6 extra cold damage (included in the attacks). Any creature that begins its turn grappling the poolhusk takes 6 (2d6) cold damage.
Icy Forditude. If the poolhusk is exposed to cold damage, it takes no damage and its skin freezes further, 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 12 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.
Turning Defiance. The poolhusk and any regular poolhusks within 30 feet of it have advantage on saving throws against effects that turn undead.
Multiattack. The poolhusk makes two Bite attacks. It then uses Freeze.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) piercing damage + 6 (2d6) cold damage.
Freeze. Ranged Weapon Attack: +5 to hit, reach 10/25 ft., one target. Hit: 6 (2d6) cold damage, and the target is restrained by ice. At the start of each of the target's turns while restrained in this way, the target takes 6 (2d6) cold damage. The creature can escape from the ice with a successful DC 16 Strength check. The ice can also be attacked (25 hit points, 11 AC, vulnerability to fire damage, immunity to acid, cold, necrotic, psychic, poison, and radiant damage).
Icewater Blast (Recharge 6). The poolhusk vomits tainted, freezing cold water in a 25-ft. cone. Every creature in that area must make a DC 16 Constitution saving throw, taking 16 (3d10) bludgeoning damage + 16 (3d10) cold damage + 10 (2d10) poison damage on a failed save, or half as much on a successful one.
An enhanced version of the undead poolhusk, a poolhusk frostborn must be created from a humanoid corpse that has been covered in water, then frozen stiff. Patchy layers of ice adorn its limbs and torso, with the untouched flesh caked with frost. Its eyes are a snowy white and seem to make the poolhusk even colder when stared into. The debilitating cold that surrounds the creature mingles with its rotted stink, making approaching it unadvised. The water that flows from a regular poolhusk's body is present inside a frostborn, but as soon as it leaves its body, the cold air surrounding it freezes it partially, causing its projectile vomit to become even deadlier. In addition to this icewater, a poolhusk frostborn can conjure liquid water from its body and then freeze it onto a creature, leaving them helpless as it moves in with its subzero jaws.
Undead Nature. A poolhusk frostborn doesn't require food, drink, air, or sleep.