Originally Posted by
Palanan
There seem to be two common-sense responses to this. First, if teleportation circles are a gateway for your enemies, it would make sense to go to some lengths to avoid using them in your city.
If you can’t possibly avoid reliance on teleportation circles (a major assumption in itself) then it seems most likely that these would be located well outside the city and fortified into kill boxes against any incoming hostiles. I’m not sure if Tippy ever really accounted for that.