Arthas's numbers are overwhelming. But with a New Plague we could eradicate both the Scourge Army and the Human infestation once and for all.
My studies have proven that spider blood combined with a toxin derived from a grizzled bear heart results in a deadly elixir. Collect samples from the spiders in the Skittering Dark to the northwest and from the bears wandering throughout Silverpine Forest. Deliver the reagents to Master Apothecary Faranell of the Royal Apothecary Society in the Undercity.
How good of Apothecary Renferrel to send you to me, <name>. These samples will indeed prove useful to the cause. I will begin studying their toxic and contaminable properties at once.