If there are mages casting good(deflective and protective spells on themselves just after finished talking,your thief or other with ranged weapons shold shoot him so spell failes
otherwise you may spend years getting rid of the spells
And:whats yuor favorite spell?
mine are magic missile and chromatic orb(now the orb petrifies targets when i cast it)
And fireball + cloudkill are good
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So says the Lord of Terror,and so it is written.