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Bore Worm

Source Pathfinder #117: Assault on Longshadow pg. 82

Bore worms are a vile breed of subterranean burrowing worm, attacking prey both in their Darklands home and, more rarely, on the planet’s surface. Three major variants of the worms exist, each representing a different stage in the creature’s long life cycle—the swarm, monarch, and empress stages.

Creatures in "Bore Worm" Category

Bore Worm Monarch7
Bore Worm Swarm5
Empress Bore Worm10

Bore Worm, Bore Worm Monarch

Bright red and coated in an opaque yellow slime, this monstrous worm has a menacing pair of barbed mandibles.

Bore Worm Monarch CR 7

Source Pathfinder #117: Assault on Longshadow pg. 82
XP 3,200
N Large vermin
Init –2; Senses tremorsense 60 ft.; Perception +0


AC 19, touch 7, flat-footed 19 (–2 Dex, +12 natural, –1 size)
hp 78 (12d8+24)
Fort +10, Ref +2, Will +4
DR 10/piercing; Immune acid, mind-affecting effects
Weaknesses vulnerable to water


Speed 20 ft., burrow 40 ft.
Melee bite +13 (2d6+7 plus 2d6 acid and painful bite)
Space 10 ft., Reach 10 ft.
Special Attacks painful bite (DC 18)


Str 20, Dex 7, Con 15, Int —, Wis 10, Cha 2
Base Atk +9; CMB +15; CMD 23 (can’t be tripped)
SQ compression, corrosive wake


Environment any underground
Organization solitary, pair, or tremor (1 plus 1d6 bore worm swarms)
Treasure none

Special Abilities

Corrosive Wake (Ex) When a bore worm monarch burrows, it can move through solid material, including stone and metal, as easily as a fish swims through water. It leaves behind a 5-foot-diameter, smooth-sided tunnel coated in acid that deals 1d3 points of acid damage to creatures coming into contact with its surface. This acid lasts a number of rounds equal to the hardness of material it burrowed through.

A single, finger-length bore worm has never been much of a threat to any one creature, but isolated bore worms are found only in laboratories. Bore worm swarms, as they are more commonly encountered, consume organic material with a voracious appetite, tunneling through the earth like water as they reach progressively larger sizes.


Bore worms, like many other vermin, provide a necessary function of the natural ecosystem, breaking down rotting plants and animals to form rich loam for farmlands. Their fear-inducing bite can cause the stouthearted to lose faith, with the mere threat of them sometimes enough to coerce information out of a torturer’s victim. Bore worms are edible and easily killed with water, though the taste varies from “chicken” to “sweaty feet.”

In their juvenile stage, bore worms congregate in an undulating morass of sticky slime. At this stage, they can be prevented from growing into their next stage simply by providing them with a steady food supply. Lack of a food supply triggers their next stage of growth, and the bore worm swarm cannibalizes itself, with one bore worm emerging victorious as a bore worm monarch.

At this point in their lives, bore worm monarchs have a driving need to consume as much as they possibly can, and are able to consume gemstones and metals, building up fat reserves for breeding. Bore worm monarchs excrete a pheromone-heavy acid slime that repels other bore worms, giving the creatures the appearance of being territorial. In truth, bore worms lack the intelligence to truly recognize one location from another, though two bore worm monarchs that get too close to one another risk making a meal of each other as they voraciously feed. Eventually, bore worm monarchs turn on the swarms, eating them until they reach the next and final stage of their lives.

Empress bore worms, the largest and eldest members of the species, live short lives in their final stage of development. Eating their own kind acts to perpetuate their species, and after a week-long torpor, empress bore worms hungrily devour everything in their path to find a suitable spot to nest—and die. They are then eaten from within by the live bore worm swarms they birth, and the fat reserves they built up during their monarch stage serve as fuel at the end of their lives.