Players need to search out Apothecary Zelana who is studying the creatures of Outland.
You will need:
Apethecary Zelana has been studying the beasts of Hellfire Peninsula in the field. She wants a sample of the blood you gathered; with luck, she might discover what turned those Bonechewer bastards' skins red!
Zelana is at Reaver's Fall, southeast of Thrallmar. Follow the road east and when you see a destroyed, green-glowing hunk of metal, you're there. She has a camp set up behind the wyverns.
Reaver's Fall is on a hill east of Thrallmar. Once you give Zelana the blood, she will perform a short test on the blood using the equipment behind her. After finishing the test, she will give you the next quest.
It is my honor to serve the wishes of the Horde. How might I aid you?
Ah, yes. The blood of the bonechewer clan. I am very curious about these orcs... they are still the depraved fiends of the past, but their strength and power is greater than what I had heard...
Well, let us begin, shall we?