Hell’s inquisitors, scorpion-tailed osyluths know two things: torture, and the information they glean from it.
A particularly impudent and imprudent imp begs to be saved from the attentions of a bone devil. Any interaction with the tiny creature is lose-lose, however. The imp is perhaps the most annoying devil alive, and cannot resist attempting to trick, torment, and corrupt its would-be saviors. Meanwhile, merely conversing with the imp is enough to attract the ire of the osyluth, who has already ripped through a magician’s college looking for it.
A city judge condemns nearly every plaintiff who comes before him, producing evidence that shocks even the prosecuting barristers. Investigation reveals the judge has subcontracted the court’s evidence-gathering to an inquisition of bone devils.
An artifact can determine truth from falsehood. Currently dormant, it requires the sting of a bone devil’s tail to operate.
—Pathfinder Bestiary 74