Ah the friends spell is cumalitive so its well do able anyway dragon whacking tips.
lots of summons
Lower resistance by 3
breach
slow
offensive magic
when it goes hostile attack with summons, use fighters to pepper it with arrows and so forth and when the summons are finished move in with melee fighters and finish it.
If you want to cheese it cast cloudkill from out of range, great if you have a wand.
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