Collect 10 Fel Orc Blood Vials and return them to Gunny at Honor Hold in Hellfire Peninsula.
That letter is going to get folks all riled up around here. They'll think there's something we might do about all those new fel orcs being created if only we knew how it was being done. It's bad enough that we have to fight the Burning Legion to the east.
So, it's your lucky day, sweetness! You get to take a stroll into what they call the Blood Furnace inside Hellfire Citadel. Sounds hot!
Get in there, kill some fel orcs and bring back samples of their blood.
You think you can handle that?