This quest is not available in game.
Collect 6 Grizzled Bear Hearts and 6 samples of Skittering Blood and deliver them to Master Apothecary Faranell in the Undercity.
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.