Site Source: Darksend (10-man)
Welcome back to the Icecrown raid guide. My name is darksend and in this video I will cover the 10 man version of Festergut, one of the two abominations in the plaugeworks.
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Festergut and Rotface are the first two encounters in the plaugeworks and can be done in either order. After you defeat stinky and precious, the two mini-bosses with mechanics similar to that of gluth in naxxramas, head left down the hall to reach festergut.
Almost imediatly after starting the encounter an orange gaseous blight will fill the room and deal periodic shadow damage to everyone in the raid. Every 34 seconds festergut wil inhale some of that gas. While This will decrease the amount of periodic damage being done to the raid, it will aslo cause him to gain a stacking buff called inhaled blight. This buff increases Festergut's physical damage as well as increasing his attack speed both by 30%. He will do this 3 times until all the gas is inhaled, gaining a stack each time. When he reaches three stacks, the tank needs to begin rotating his or her own cooldowns as well as any external cooldowns to survive until the next ability 34 seconds later. This ability will be Pungent blight.
Pungent blight deals massive shadow damage to the entire raid by releasing all the inhaled gas back into the room. This will resume the raid damage but it will also completely remove festerguts buff. This cycle repeats until the 5 minute enrage timer. In order to counter the pungent blight, every 40-50 seconds 2 random raid memebers will get a debuff called gas spore. When the spore explodes, it will hit everyone nearby with a dot called blighted spores. When this dot runs out however you become inoculated, which is a stacking debuff that actually helps you, decreasing shadow damage recieved by 25% per stack. However the counter works both ways, pungent blight will also completely remove your inoculated stacks.
While this is going on there are also two other abilities he does. The first is only on the target he is attacking. Bastric bloat is another helpful debuff. It does about 10K damage when the stack is applied but each stack inceases the tanks damage by 10%. The down side is if the stack reaches 10 the tank will instantly explode killing himself and dealing about 30K damage to all raid members in range. This is actually a good thing because by forcing tank transitions you get a second full set of tank cooldowns to use during the time when he has 3 stacks of inhaled blight. We found taunting at 8 stacks to be the best way to handle the transitions. On the plus side, the tank can now go cat form, blood pressence, click off righteous fury, or do battle or berserker stance and do some decent damage for the minute and a half or so with that 80% increased damage buff before taunting back, just dont forget to swap back.
The final ability is vile gas, which inflicts moderate shadow damage every 2 seconds for 6 seconds and additional damage to nearby players. It will also disorient anyone hit by it so it is very important for ranged to stay spread out.
As long as you can ensure that you have enough ranged for this to never hit a melee, your tank healers should always be stacked with the melee. This also has the advantadge of that healer never having to move to get a spore.
We did this with 2 ranged dps and 3 healers, one of which standing in melee range. We worked out on vent before hand which dps would run into melee if they both got a spore. obviously if one healer and one dps got it the dps would move allowing the healer to keep casting, and if both healers got it the resto druid would have moved into melee due to the ability to cast while moving.