These carnivorous insects are easily recognized by their long, spindly legs and compact bodies. When hunting, a yarzon first seeks to immobilize its prey by spraying its joints with a stream of corrosive bile. Having done so, the vilekin then penetrates the victim's cranial cavity with its dagger-sharp feeding rube and sucks out the brain. Species of the yarzon can be found thriving in both humid marshes and arid badlands around Eorzea
- a testament to the creature's impressive adaptability. 
Fiercely territorial, these creatures will attack anyone who strays too close to their riverbank nests, making them the bane of fisherfolk
. They typically fall upon their prey en masse, barring all avenues of escape before closing in for the kill.