This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Search Orgrimmar for Ragefire Chasm, then kill 8 Ragefire Troggs and 8 Ragefire Shaman before returning to Rahauro in Thunder Bluff.
Beneath the city of Orgrimmar, stout creatures known as troggs started coming to the surface from deep below the lava filled tunnels. In her ever-benevolence, Magatha sought to make peace with the creatures, but they turned on her diplomats, killing them. She will not allow such treatment of the tauren people and now consider the creatures a threat to all of the Horde.
She asks that you put an end to this trogg threat before it overwhelms the Horde from below. Find Ragefire Chasm and destroy them all.