Gahz'rilla

Gahz'rilla is a level 46 elite hydra boss summoned in Zul'Farrak.

Lore
Long ago, when trolls used to occupy the land of Tanaris, they built up Zul'Farrak, the sand troll city in Tanaris, with a sacred pool. From that pool the trolls summoned the huge hydra Gahz'rilla, so fierce that even his scales crackle with energy. The trolls worshipped him as a deity, but the summoning of Gahz'rilla is a well-kept secret of the trolls. Gahz'rilla is said to be a demigod.

Large amounts of ornaments have been modeled after the beast Gahz'rilla. These ornaments are called "Gahz'ridian", after the hydra demigod.

Summoning
Prior to patch 3.0.8, Gahz'rilla had to be summoned. The process of summoning Gahz'rilla is written on Ancient Tablets that drop as vendor trash in the instance.

The process involves travelling to The Hinterlands to acquire The Sacred Mallet carried by who resides at the Altar of Zul. To transform the Sacred Mallet into the, one must bring it to the Altar of Jintha'Alor at its very top.

With the Mallet of Zul'Farrak, Gahz'rilla's gong can then be rung. However, it is wise to clear the area first, as Gahz'rilla can knock back players.

As of patch 3.0.8, Gahz'rilla no longer needs to be summoned. He is simply present at the location he used to appear upon being summoned. The Mallet of Zul'farrak has since been turned into a rare weapon with fairly decent stats and rare skin.

Strategy
All mobs around the pool should be cleared first, as Gahz'rilla will occasionally launch players through the air which may cause them to land in a group of mobs. Gahz'rilla does not automatically aggro to the players when summoned, and knockback damage can be avoided by landing in the pool of water where he is summoned.

Cataclysm
The Sandfury tried to strengthen Gahz'rilla to attack Stormwind. Hydromancer Kulratha attempted to send her into Stormwind and Thunder Bluff, however heroes lead by Varian Wrynn and Cairne Bloodhoof invaded Zul'Farrak, slain Kulratha aswell as Gahz'rilla. It is unknown what happened to the Sandfury after her defeat, although she did appear to have small versions of her swimming in her pool of water.

Trivia
If the name is closely examined it sounds like "Godzilla". It also bears a close resemblance to Godzilla's opponent Ghidorah.