<1. While it does eat planets, it takes a long time and breaks it off piece by piece.
2. It has mechanics in place to convert planetary materials into fuel and other substances. Emphasis on other substances.
3. It has lasers and everyone knows the best mining is done with lasers.
So why does it have a city on top? Well you need homes for the crew. Clearly this was all built before Calus was exiled as all the architecture isn't rugged on the outside.>
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I mean, besides for his wine and pretty purple crystal floor, what else would they be mining for? It’s kind of clear that they have no need for funds, considering the absolute [b]UNIT[/b] of a ship. Maybe they use that excess material from his wine-making to create his robots? Idk.