The levers in question are the three in the SW corner of the room. Pull the middle one and watch what the golem says. If it's "Inner Sanctum" selected, then pull the left-most and everyone becomes ethereal.
If the golem says "Battle Square" selected, first pull the right-most lever, then the left-most. The rank levers aren't used here.
As for Oria, yeah, you've just killed her sisters, so you should expect her to maybe be a tad upset with you. Doesn't matter, because she has to go, too.
Nightowl2
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