According to Berard's Journal the moss from Lake Skulkers and Creepers might prove useful for our quest to brew a new plague.  Those beasts dwell on the islands in Lake Lordamere to the east.$b$bHe also mentions a very rare Hardened Tumor that he discovered on a Vile Fin murloc.  Apparently the tumor is so rare Berard was only able to obtain one.$b$bCollect samples of the moss as well as the rare hardened tumor and take them to Master Apothecary Faranell in the Undercity.