Hmm sewer never considered that, I might do this but it would be hard to make out of twilight terraign. Thanks for the idea!

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I had one more idea that I forgot to mention: the ruins of a temple or some other ancient structure (kinda like AvP). For the sewers, I'd suggest Badlands or Installation (there's the cliche again) terrain; if you're gonna go ahead with my ruins idea, either keep Twilight or try Desert, Ice, or Jungle.