Isa Worm

Gargantuan monstrosity, unaligned
AC: 18 (Natural Armor) HP: 193 Speed: 50 ft., burrow 30 ft.
STR 25(+7) DEX 7(-2) CON 22(+6) INT 1(-5) WIS 8(-1) CHA 4(-3)
Saving Throws: Constitution +10, Strength +11
Damage Vulnerabilities: Fire
Damage Immunities: Cold
Senses: Blindsight 60 ft., Tremorsense 60 ft., Passive Perception 9
Languages:
CR: 12
Tunneler: The isa worm can burrow through solid rock at half its burrow speed, and it leaves a 10-foot diameter tunnel in its wake.
Snow Camouflage: When it is lying still and is buried halfway in the snow, it is difficult to spot the isa worm. A creature that comes within 150 feet of the isa worm must succeed on a DC 17 Wisdom (Perception) check, to become aware of its presence.
ACTIONS
Bite: Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: (6d8 + 7) piercing and (4d8) cold damage. If the target is a Large or smaller creature, it must succeed on a DC 17 Dexterity saving throw, or is swallowed by the isa worm. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects coming from outside the isa worm, and it takes (6d6) acid damage at the start of each of the isa worm's turns. If the isa worm takes 30 damage or more, on a single turn, from a creature inside it, the isa worm must succeed on a DC 21 Constitution saving throw at the end of that turn, or it regurgitates all swallowed creatures, which are knocked prone in a space within 10 feet of the isa worm. If the worm dies, swallowed creatures are no longer restrained by it, and can escape from the corpse by using 20 feet of movement, exiting while knocked prone.
Tail: The isa worm swings its tail through a 30-foot cone. Creatures that are within the area must succeed on a DC 17 Dexterity saving throw or they take (8d6+7) bludgeoning damage.

With a skin that looks like made of snow, and tusks that look as sharp and crystallized as icicles, frost worm is the dreadful predator of the tundra. Frost Worm is not picky about its prey when it is hungry. And it is alwayshungry… In areas with deep snow, the presence of isa worms make another sort of trouble as well. When they wander within the snow, they create pathways with softened snow. When adventurers walk into them, they slide into the soft snow and get burried inside. Slowly freezing to death before an isa worm comes by to eat them. Some rangers of Skadi try to keep a close eye on these pathways. They wander around to warn people off from such dangerous areas, and guide them into safer passages. Still, it is not unknown for a Skadi ranger to just leave those arrogant enough to meet their hidden doom.

Average Weight

Ton