"But the summoning of Gahz'rilla is a well-kept secret of the trolls. To face him, you must first wrest the secret from them."

Head over to the Hinterlands and find Qiaga the Keeper (https://classicdb.ch/?npc=7996), she should drop a Sacred Mallet (https://classicdb.ch/?item=9241).

Take the mallet to the Jintha'Alor altar located at 59, 77. When used on the altar you'll end up with the Mallet of Zul'Farrak (https://classicdb.ch/?item=9240).

Use that to ring the gong at the end of Zul'Farrak. This will summon Gahz'rilla. Good luck!

Once you are in Zul'Farrak, you can find Gahz'rilla's room by heading left when you can. His room has a large pool with a gong at one end. Before you summon him, take time to clear out some of the mobs in the room, particularly the patrols. There are single patrols as well as multiples, including at least one trio of two hunters and basilisk. Take special note of the mobs in the corners, as they can be hard to spot. You don't have to get rid of them if you don't need/want them, but you need to be aware that they are there. Also watch for patrols that come from the adjoining hallways. You likely took out the patrols from one of the hallways on your way in, but the narrow hall on the east side of the room has one or two mobs that patrol into the big room. Their patrol route is long, so you might not see them unless you know to wait for them.

Hydromancer Velratha is also in this room, and is worth taking down even if you don't have the Tiara From The Deep quest. She is a bit tougher than the usual mobs and would be a nasty add if you don't take care of her before you summon Gahz'rilla.

If you don't want to clear the entire room, you need to take out Velratha and all patrols, then clear the static mobs closest to the pool. Depending on how long you take, watch the hallways for the patrols to respawn. They often come right up to the pool, and that will almost surely make for a wipe.

Once you are ready, have a party member with the enchanted mallet use the gong while everyone else stands away from the pool. The gong ringer in your party should also beat a hasty retreat as soon as they finish with the gong. Gahz'rilla will exit the pool to the north, where the steps are. He will pretty much hang around this area unless you attack him or get too close. Once he's at the stairs, jump in the gong end of the pool and pull him to you.

Gahz'rilla is a level 46 elite, but that level is deceptive. 46 is only a level or two higher than the general mobs in the rest of the instance, but he is much more difficult than that. He has a frostbolt spell, a lot of health and a very nasty pop-up attack. His pop-up attack launches you high into the air, which means a lot of damage from the fall. This attack is not targetted and hits everyone who is close enough. Mages and priests (who are way too close if they get hit by this attack...) can use Slow Fall/Levitate to avoid damage, but everyone else will have to take their knocks. If you are fighting in the pool, you will hopefully land in the water, taking no damage. If you fall on land, you will lose around 20%-25% of your max health (not current health). Have a potion ready just in case, then jump back in the pool and move towards the middle. If you can avoid the pop-up attack, you'll find that he is not too tough to take down.

For those of you who missed this quest at first, or earlier scoffed at the Carrot on a Stick reward, and are doing this at higher levels, you won't need a full five man group to do this. My 55 shaman and a 51 shaman paired up and we were able to go from the start of ZF to beating Gahz'rilla with no problems.

The specifics on how to obtain and charge the hammer to summon the beast can be found in zul'farak on an "Ancient Tablet" which is a random drop off mobs there (probably somewhere around 1-2% drop rate).&nbsp

The hammer is found on a troll the top of the altar of Zul in the Hinterlands.

The hammer has to be charged at an altar deep inside Jintha'Alor, which is another troll encampment, also in the Hinterlands.&nbsp

Personally, I think obtaining the hammer to summon gahz'rilla is more difficult than actually slaying him.&nbsp YMMV.&nbsp Good luck.

Since there is some confusion on how to obtain the mallet.

Well first of all you obviously get the quest from the guy in the Shimmering Flats (Thousand Needles), Wizzle Brassbolts at 77,77.

Then you go to the Hinterlands. At the altar of Zul at 48,68, on top of that (small) altar there is a woman called Qiaga. When you try to kill her the other mobs agro you, but I was able to solo it all with a lvl 60 lock.
She drops the uncharged mallet.

Then you go to the east. When you arrive at Jintha'Alor don't bother killing any of the mobs there. Just stay on your mount and follow the path and the stairs until you get close to 57,78.
There you will see a (very) small altar guarded by a few elites, a few wolves and a priestess. Also there is some horde guy lying on his back.
The only thing you need to do is stand on that altar and right click the mallet in your inventory to charge it. You can choose to kill the mobs but you don't have to.

Then you scroll up and look for the first yellow post for further instructions :)

Jintha'Alor is a very boring and bland area and it is pretty hard to find a group willing to escort you to the top to get your mallet enchanted. You can naked corpse run (or feign death/vanish) your way up there and if timed correctly (the Priestess enters the cave every now and then), you can approach the altar and charge your mallet without waking the guy sleeping there, then hearth out.