1) not anything major so far since it'd be a pain to think of writing up kingdoms that we'll most likely never visit due to the tower being the only tower in the world
2) no other towers besides babel
3) nope, but you never know...after all, there are other arcs after this so thanks for the ideas XD
4) the magno backstory states the queen is in power over the factions
5) they could know of this if they were educated 
[@Duoya]