Ghaz ' an Hydra boss of The Underbog in Coilfang Reservoir . Strategy . This boss walks onto the center platform when you enter his chamber . There is a wall of vertical pipes to the right and many tanks place their backs against this . The important thing is that the tank doesn ' t move the entire fight so that the rest of the group can stand to Ghaz ' an ' s sides . If you are in front of him you will be hit by his nature breath attack and behind he will tail swipe you off the platform . If you get swiped off you can swim to the ramp and run back up but you will be out of the fight for approximately 45 – 60 seconds . Other than the Nature breath attack and tail swipe , Ghaz ' an has no special abilities and is easily dispatched if everyone is positioned properly . An easy way to think of this is setting it up similar to Onyxia . Note : Another , maybe easier , way is to have ranged DPS looking at the ramp from the side , and the Tank can then go to Ghaz ' an and pull him all the way down the ramp ( the ramp that ' s leading to him ) so the tank can have his back up against the wall - Ghaz ' an ' s back will point towards the centre of the room where he started - that way the DPS can stand on the side DPS ' ing him down without thinking about tailswipes and falling off the edge . Very effective . Ghaz ' an ' s Acid Breath is the main problem in this fight . It is a binary resist ( meaning you can fully resist it or it can do full damage ) and stacks up to 10 times on players . Each applications of the Acid Breath deals 155 damage every 3 seconds and refreshes the duration of the debuff , so a tank with 10 applications will be taking 1550 damage every 3 seconds in addition to the 1500 - 2000 instant damage each time Acid Breath hits . For this reason Nature Resist for the main tank can make this fight a cinch and lack of Nature Resist can make it very difficult . Shamans should place their Nature Resistance totems or Hunters can use Aspect of the Wild . No one other than the Main Tank should be hit by acid breath . If you are hit by it , you are too far in front of Ghaz ' an and should move closer to the rear of him ( just not into tail swipe range ) . Assuming proper position , the fight is a tank and spank with no surprises . Heroic mode . Ghaz ' an appears to hit from anywhere between 1700 - 2600 on moderately geared tanks , and can sometimes get a string of up to 3 attacks in a row . Besides this , the only other significant change appears to be a moderate increase to the Acid Breath damage . If you have light healing , an alternate strategy is kiting . He moves very slowly , and will follow you all the way to the instance entrance . A combination of warlock + ranged dps works . NOTE : in heroic mode , this boss has around 70 - 110k hp . You can burn him down between a time frame of 20 to 30 seconds with a good group . Should you lose anyone in the water , the fish die along with the boss allowing safe resurrecting . NOTE : This boss moves quite slow , making it easily soloable by a warlock or priest by running and dotting . The platform from the first boss can be used to circle the boss around and run him back to his start point and repeat . This takes around 4 minutes . Trivia . In the Burning Crusade beta and for a short time after release , Overseer Tidewrath was a part of this encounter .