He finds in a book called Jaffer's Journals:
"We found our companions. Half-butchered, half-eaten on stone slabs in the central lair. One man was still alive, but so mad with pain it was a mercy to slice his throat. While Lucole was praying for the souls of our friends a single gnolls snuck in upon us. Unseen, it got close enough to Lucole to scream a single angry word, "Yeenoghu" as a foul darkness covered the room and our dead rose to their feet. A foul stench wafted from them and we were beset by ghoulish foes. I know nothing of the dark god this gnoll called upon, but I know a god it must have been. I shall never return to that cavern, nay even those mountains. I lost too much there."