you can walk back to the entrance, luring the guards with you and killing them.
in one of the chests in the hall to the 4 elementals is a potion of elemental resist, it might save you for the first few spells. if j'nah is the only one left you could just hack her (if you want to do it cheesy walk away close the door and wait for protection to wear of then you have a few attacks before her protections are up)
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