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I have thought about a way to get inside of the city but I would need the cooperation of some people in here, those two would be Erebus and Rust. The two of them had shown to be capable of "hacking" technology one way or the other. What Erebus does is using his soul to infuse himself into magic technology, it seems that being a dungeon sort of makes him compatible with such items. I have yet to understand it well, but apparently dungeons are very similar to magic technology for some reason, it is as if they were entities very similar to the structure of how magic technology works, so for a powerful dungeon such as Erebus, it is easy for him to do things such as hacking them and modifying them, as if he could infect them.