Assistant Wilabus in Blackburrow (in spider cave at 49, -40, -16 ) asks you to snatch him some brew from the gnolls.
The brew is found on a table in the brewery area (approximately 36.55, -39.91, 74 ). Examine the jugs and then return to him for your reward.
He gives you an Agate Geode and some experience/coin. We are not sure what to do with the Geode at this time.