winning strategie that came to my mind like just now.
character needed.
High wiz
Paladin
Ministrel
scholar
paladin scarifice on the ministrel
dex/int ministrel use marionette controle on the High wiz
scholar use deluge
High wiz water ball everything 1 shot instant .
while the hp and paladin can still heal everyone
while the biochemist AD AND aid pot and the mastersmith break weapons
you could also have another bard, to reduce everyones delay with magic string.