hello , i tried this endlessly for 2-3 days and then realised that you really are better off just accepting that you cannot kill kuunavang until the final battle in the arena.
Just take a balanced team , 2 monks, 2 eles <-- definately needed, 2 warriors, mesmer, necro mm.
We have now done this mission bonus about 5 times in a row now with this team makeup, you must obviously fight your way thru the inflicted, i being the team mesmer am constantly using backfire and interrupts on the monks and casters while the rest of the team also targets my calls.
we mostly ignore the kuunavang and only damage him enuff to open the next gate,we keep moving all the time and keep well away from the spores and stuff he drops.
We also try and stay well away from each other as the chain lightning can devastate your team very quickly,once we have the afflicted all dead we then attack kuunavang and take him down to 25% health this is when the arena battle starts, when it comes to the final battle we all run to the far right and far left hand side next to kuunavang but away from the spore things he fires towards where you have just spawned.
Our eles then run directly behind kuunavang and keep dropping heavy hot crap all over his head while im using clumsiness and backfire on him, he never lasts more than about 20-30 secs if you do it right and we take next to no damage.
we will gladly help anyone complete this mission if they give us a shout.
http://www.guildwarsguru.com/forum/s...68#post1864768