Setting Up the Bomb
Obtain a Fel Reaver Power Core and a Fel Reaver Armor Plate, then bring them to Blood Guard Gulmok at Shadowmoon Village.
We can't allow the Legion to trample us on their march to Black Temple.$B$BFind a way to destroy the infernals they intend to use against us. That's not a request, $N; it's an order.$B$BThe Fetid Pool near Legion Hold holds an old fel reaver power core you could use as the basis for a kind of fel bomb. Search the other wreckage near the fel reaver for a section of armor plating. You should be able to make a bomb powerful enough to take out those infernals and give the hold a nice shake!
Required Level
67
Side
Horde
Recommended Level
69
Difficulty
73
76
Start
End
Locations
Progress
Completion
That should do the trick. I wouldn't want to be in the hold when that thing goes off.
You will receive: 4 
10 
11 48
Gains
Upon completion of this quest you will gain:
- 12300 experience