[ Carefully considering all that he'd said Lily nods, as she tries to puzzle it out a little more before speaking again. ]

You're right of course, but why not ally themselves with other citadels? Turning traitor is just–

[ The idea doesn't sit well with her, and even the helmet of the suits they'd all been given to wear can't fully hide the disapproving look on her face. ]

Perhaps one city was founded by former residents of the other? Gone off to practice magic how they wanted to?