Chill Body. A creature that touches the frost worm or hits it with a melee attack while within 5 feet of it takes 10 (3d6) cold damage.
Death Burst. When the frost worm dies, it explodes in a burst of jagged ice. Each creature within 5 ft. of it must make a DC 18 Dexterity saving throw, taking 42 (12d6) cold damage and 28 (8d6) piercing damage on a failed save, or half as much damage on a successful one.
Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 40 (6d10 + 7) piercing damage plus 10 (3d6) cold damage. If the target is a creature, it is grappled (escape DC 17). Until this grapple ends, the target is restrained, and the frost worm can't bite another target.
Swallow. The frost worm makes one bite attack against a Medium or smaller creature it is grappling. If the attack hits, that creature takes the bite's damage and is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the frost worm, and it takes 21 (6d6) acid damage at the start of each of thefrost worm's turns.
If the frost worm takes 30 damage or more on a single turn from a creature inside it, the frost worm must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the frost worm. If the frost worm dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 15 feet of movement, exiting prone.
Frost Breath (Recharge 6). The frost worm exhales an icy blast in a 60-foot cone. Each creature in that area must make a DC 18 Constitution saving throw, taking 54 (12d8) cold damage on a failed save, or half as much damage on a successful one.
Description
With armor-crushing jaws, flesh that radiates cold, and a terrible keening cry capable of holding creatures fascinated, frost worms are apex predators of the frozen tundra and glaciers. In the frost worms’ far-reaching hunting grounds, they fear only the remorhaz, for the heat generated by an enraged remorhaz causes intense pain to a frost worm.
This extreme aversion to heat, as well as its freezing touch and devastating breath weapon, stems from an unusual facet of frost worm physiology—veins that run with magically cold blood. This creature’s ichor is clear, but infused with such sub-freezing temperatures that the monster’s flesh can freeze water in the skin of Creatures that touch it. When a frost worm dies, this magical energy dissipates, and both blood and muscle immediately freeze solid and then explode into a catastrophic barrage of icy shrapnel. As a result, even those predators that might legitimately prey upon the burrowing monstrosities tend to leave frost worms well enough alone.
An adult frost worm measures 35 feet long and weighs 8,000 pounds.
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