Chain Worm

Chain Worm

This creature looks like a massive centipede with a bright, reflective silver carapace. Its legs are dull silver and its oversized mandibles are black. A dull black stinger is located at the rear of its body.

Chain Worm

XP 8,400 ()

Unaligned Large

Initiative +3


AC 21 (natural armor)

hp: 161 (17d10 + 68)

Immunity: Psychic damage; fright


Speed: 30 ft., climb 20 ft.

Multiattack: The chain worm bites once and stings once with its tail.

Melee Attack—Bite: +10 to hit (reach 5 ft.; one creature). Hit: 2d10 + 6 piercing damage, and the target is grappled. While the chain worm maintains a grapple, it can only bite the grappled creature.

Melee Attack—Tail Sting: +10 to hit (reach 5 ft.; one creature). Hit: 2d8 + 6 piercing damage plus 2d8 poison damage, and the target is poisoned (see below). This attack has tactical advantage against targets that are grappled by the chain worm.


Str 22 (+6), Dex 16 (+3), Con 19 (+4),

Int 1 (–5), Wis 12 (+1), Cha 4 (–3)

Languages: None

Senses: Darkvision 60 ft., tremorsense 60 ft.


Poison: A creature poisoned by the chain worm must make a DC 16 Con saving throw at the end of each of its turns. On a failed save, the creature takes 2d8 poison damage and remains poisoned. On a successful save, the poisoned condition ends.

Trilling: By rapidly vibrating its carapace as a bonus action, a chain worm emits a high-pitched trilling sound that stuns and deafens creatures within range. All living creatures within 30 feet that can hear the trilling must make a successful a DC 16 Con saving throw or be stunned and deafened. Stunned characters can repeat the saving throw at the end of each of their turns; a successful save ends the stunned condition, but the deafness lasts until the end of the creature’s next long rest.


Environment: or

Organization: Solitary, pair, or pack (3–5)

Chain worms are terrifying predators with an insatiable appetite for meat. The creatures have a particular fondness for dwarf, gnome, and bugbear flesh. Chain worms often build their nests near communities of these creatures. Though not particularly fond of cold or damp weather, chain worms can be found almost anywhere, as their bulky, heavily armored exoskeletons offer ample protection against almost any environment.

A chain worm’s nest is a hole or tunnel littered with rocks, bones, refuse, and debris, and often located on a rocky outcropping or ledge where it is nearly inaccessible to most creatures. Any valuables found in its lair are simply the remains of previous meals that the chain worm couldn’t digest or didn’t bother eating.

Chain worms stand nearly 6 feet tall and are about 10 feet long, with silver carapaces and dull silver legs. Their heads sport oversized, dull black mandibles that constantly drip brownish-gray saliva. A chain worm’s tail stinger is almost a foot long and jet black. As they age, their tail stingers fade to dull gray.

A chain worm lies in wait for a meal, attacking whenever its target comes within range. Once it grabs a foe in its mandibles, it stings the victim repeatedly until the unfortunate creature dies.