The corruption that rains down from Hyjal flows through the mountain's waters and seeps into everything here in the wood. The creatures that drink the water take the corruption into themselves. It makes them ferocious, diseased, and fearless. To counter these effects, I must understand them, and to do that I need samples from the afflicted. A few samples of putrescent organs from the wolves and bears should do. Take your time; the creatures are common here in Felwood.