try 2 priest with obligation 7s =24/7 obligation means forever damage cut by half or more.
a tip that people rarely think is, GIVING DELAY to each buff so you wont rebuff all in one go.This is very important.
2 rumirs with 7s heal and loop will ensure survival.
the other 2 can be preds because their dps aoe damage and heal traps(add more survival.
idk the damage of marea disciple type mob yet(I am lazy to check), but mybe reach 100k? i tried gail disciple before GM reduce their damage and they hit me 100k. Im wth upg.
http://oi66.tinypic.com/2gsnbth.jpg
that is my pred without oligation and no pve pendant. with upg tho.
so maybe if we use enough support pt its managable
As for ISEN i feel sorry guys. :P