Who's to say that today, an ambassador from an unknown Kingdom doesn't sneak though a portal in the stone labyrinths and settle somewhere in Yliakum ? Perhaps he's got some political reason for being here. Perhaps he intends to expand his kingdom into Yliakum and recruit local citizens and guilds, offering them titles and positions in this new establishment ? This kingdom might have a very rich history that newly recruited members might wish to read about or they might be extremely secretive about their origins. Perhaps they have some very different customs, stories, parables, greetings, and superstitions ?
I thought It might be fun to start something like this. A rather mysterious empire so to speak. Yes, it would need to be careful not to attract the wrong type of attention as piss off the Octarchy.. and No, it would not drag in things that conflict with the settings like unheard of beasts, a different magic system, etc..
Perhaps this remote land is populated with the same creatures and races and knows of the same gods and has the same glyphs ? Perhaps when they cast spells they do it a little differently.. Perhaps due to the way they handle the glyphs they cast the same spells but with small variations in appearance and effect ?
Does this sort of thing sound unreasonable or out of setting ?
I think it might be fun if enough players thought so and if it was ok to do settings-wise.
Whether or not such an enterprise would succeed or fail is another story..