Have as many Wish spells as possible memorized, and during the lulls in combat keep your fingers crossed, cast them, and PRAY that you get "Make it as if my entire party has rested an entire night and rememorized all their spells." The beauty of that is, you also rememorize Wish.
Nifty little bug: If you want to be a filthy dirty cheater and exploit what is probably a bug, you don't need to cut off the power supply that's being guarded.. Use Dimension Door to get to one of the other "islands" and you can actually shut off the flow from there. But I don't recommend it.
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