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If draining the water doesn't work and there are still ten twenty-centimeter-long creatures swimming around when we return, then we can really unleash a hurricane on them. Revan said that he'll only target the guys in the room. It's expensive, of course, but we don't have a choice: firestorm and wave won't work, and an earthquake... well, you can imagine.
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I might try to catch a few myself. But it's not a sure thing.