Lifedraining Body. A creature that is within 10 feet of the worm takes 10 (3d6) necrotic damage.
Tunneler. The worm can burrow through solid rock at half its burrow speed and leaves a 10-foot-diameter tunnel in its wake.
Wriggling Progeny. Whenever the worm scores a hit against a creature with its bite attack the target must make a DC 19 Constitution saving throw. On a failed save, 1d4 century worm larva burrow through the target's skin and make their way toward its heart, dealing 1 piercing damage per larva to the target. At the end of each of its turns thereafter, the target takes 7 (2d6) necrotic damage per larva infesting it (maximum of 10d6). A larva-infested target can repeat the saving throw for each larva infesting it at the end of each of its turns; on a success, a single larva withers away. A larva-infested target dies if it drops to 0 hit points, and then each larva takes 100 years to grow into a new century worm. If a larva-infested creature is targeted by an effect that cures disease, all the larva infesting it wither away.
Legendary Resistance. 3/Day O O O
Multiattack. The worm makes two bite attacks or uses its slam attack
Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 22 (3d8 + 9) piercing damage, and 10 (3d6) necrotic damage. If the target is a Large or smaller creature, it must succeed on a DC 19 Dexterity saving throw or be swallowed by the worm. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the worm, and it takes 21 (6d6) acid damage at the start of each of the worm's turns. If the worm takes 30 damage or more on a single turn from a creature inside it, the worm must succeed on a DC 21 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 worm. If the worm dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.
Slam Attack. The Century Worm arcs its body upward and slams it down on each creature within a 60 feet long 10 feet wide area. The target must make a DC 19 Dexterity saving throw or take 19 (3d6 + 9) bludgeoning damage, and the target must make a DC 19 Constitution saving throw, taking 32 (8d6) necrotic damage on a failed save, or half as much damage on a successful one.
Description
Century Worms burrow through the snow, dirt, ice, and rock. These enormous monstrosities eagerly consume any living creature they can wrap their jaws around. A century worm spends most of its time beneath the ground, conserving energy while it waits for prey to pass overhead. Smart travelers can identify the worm´s hunting grounds by looking for recently iced-over tunnels. When the worm senses vibrations above, it bursts forth through dirt, ice, and snow.
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