Originally Posted by
Kulimar
Hmm, You should be able to farm the materials on the harder difficulties of the previous worlds. Ailing Kingdom Madness and Kingdom of the Sands Hard.
Other than that, try different combinations of characters and Troopers. I think I beat that boss with War Dog, Wickerman Eddie, Soldier Eddie, and a Healer. If you have AOE immunity I think that is also probably good. I think the fire Pyro has that. Or the Magus Allied Solider actually could work too, would reduce and reflect back a lot of damage from the waves.
Give it a try and see what happens.