Gong of Zul'Farrak
From WoWWiki
The Gong of Zul'Farrak can be found in the outdoor instance Zul'Farrak, in the Tanaris desert. This gong, when hit with the proper tool, is said to summon a mighty monster known as Gahz'rilla, worshipped by the Sandfury trolls (see 
[50] Gahz'rilla (Dungeon) ).
Activation
To activate the gong and summon Gahz'rilla, you will need the [Mallet of Zul'Farrak]. See the quest [50] Gahz'rilla for instructions on obtaining the mallet. Once you have the mallet in your inventory, right-click the gong to ring it and summon Gahz'rilla.
Quests
The Gong of Zul'Farrak is involved in the following quests:
[50] Gahz'rilla
- Bring [Gahz'rilla's Electrified Scale] to Wizzle Brassbolts in the Shimmering Flats.
