I agree with you there amity,the AI basically choose an attack style(what spells are cast etc) on wether they think your a caster because your wielding a stave or melee because your wielding a melee weapon.
Other than that,only reason i can think of for using a stave or +5 energy melee weapon and offhand is wether u need the extra energy + other mod on the weapon or the wanding dmg.
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