From publisher blurb:
Auguries and divinations are a potent tool in the day to day life of a venturer. Stone casting, bone casting, tea leaves, star gazing ... none of these methods cause alarm, even if the results might. Messier means of divination, those involving chicken hearts and goat entrails, are also popular in some circles. Arguments over the validity of one method over another is best left to the specialists. However, divination through the reading of human entrails is almost universally frowned on ... by humans. Snakefolk, on the other hand, consider it the very best method for portents and prognostication.
Word has gotten around that a nearby burrow of Dire Rats was recently overrun by a colony of Snakefolk. They have probably already captured some local farmers or trappers and dug through their guts for signs about the awakening of their Great Serpent. The Snakefolk may have other machinations in motion, but they are always looking for a way to loose the Great Serpent and watch it devour the world. The Dire Rats aren't around to ask for help, but whatever treasure they had is probably still in the old burrow.
Are your adventurers prepared to clear out an apocalyptic cult of snakefolk?