there are couple spells are useful in this kinda combat, summon that sword (forgot the name, havent touched the game for too long)
get a lower resistance spell, which can be purchased once you done the druid grove's quest (back in town)
note: you DO NOT have to kill those bastards just yet, so go buy the lower resis spells
once you have them, put them in a sequencer (or whatever that lets you use three lower resis) then cast on one of them, and begin bombarding!
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