Anyway, back to topic....
I don't think 4T is needed for this fight. The main reason we lost people in P3 was due to the tanks kiting and people not being aware enough of the choking gas cloud/Malleable Goo.
He needs to be moved as he cast the Flasks, because anyone hit by the explosion will be knocked back (probably into slime) hit for 16k dmg and have their hit reduced by 75% for 15 seconds! There seems to be some thought out there that standing on them makes them explode (from what I've heard over vent). As far as I can find this isn't the case, they will just explode after 20 seconds, hitting anyone within 10yrds. When they are first cast they pulse aoe dmg within 3yrs and give the hit debuff to anyone in that range. So yes, standing on them is bad, but it doesn't make them explode.
Stratfu wrote:Tanks
It is your responsibility to move the boss away from the orange vials. If you don't, its not melee's fault. Its yours. Melee needs to move away from the vials as they do 6k aoe damage and explode for ~18k, so just dont sniff the fumes. The big issue is the 75% hit rating debuff which nerfs your dps into the ground for 15 seconds.
So basically the tanks need to move him as he casts the Flasks, but not so far or fast as that the dps can't keep up. /cast choking gas cloud - move boss 12/15 yards - nuke - rinse and repeat. Also if he is moved to fast then we will be overwhelmed by the slime pools. Not an easy job, granted
You may of seen in the logs people dying from the tank debuff, but this wasn't generally the debuff alone. It was a case of a lot of people getting hit by the flasks or by the goo for 16-20k and the debuff finishing them off. Obviously people getting hit by the flasks makes healing near impossible. I have read strats that suggest 4H in 25.