|Bore worm swarm|
Source: Bestiary 3, pg(s). 36–37
|Empress bore worm|
Source: Bestiary 3, pg(s). 37
Bore worms by themselves are not a great threat. However, the creatures tend towards swarms numbering in the tens of thousands. The overwhelming force of such a large number of hungry creatures corrode their prey with their acidic bites and resist most forms of physical assault. Bore worms are, however, famously weak against water.
The common bore worm is frequently used as a farming aid in the Darklands due to its excrement's utility as a fertilizer, though this brings some level of danger. If the bore worms are not kept adequately fed, after a certain point and chemical signal, the creatures will descend into a cannibalistic feeding frenzy, destroying the farmer's supply of fertilizer as well as likely more. The lone survivor of this experience rapidly grows into the enormous so-called empress bore worm. The empress bore worm lives a short life, focusing only on eating and finding a location that could sustain a new swarm. Once the empress bore worm finds such a site, she dies and produces the next generation of bore worms.
Variants of bore worms are found throughout Golarion. Ice worms, often found under the Crown of the World, are pale blue and their acid inflicts rapid frostbite rather than corrosion. Lava worms, living in the volcanoes and lava flows of the Darklands, spit lava and fire rather than acid and eat minerals and rocks. The great ghoul city of Nemret Noktoria long ago developed an undead strain of necral worms to serve as negative energy batteries. The final usual variety of bore worm is the luminous, purple mage-eater worms of the Mana Wastes, whose swarming bites can disrupt magic cast on a target.