A Hand Mirror, A Crystal Paperweight, and a lit Oil Lamp.
'Cousin Eisen. If you're getting this, then you've come back and I'm gone. Don't worry, I've just relocated myself. But enough chatting, down to buissness. I've monitored Eden as best I can, and things are....odd. The dome hasn't changed, but there appears to be some sort of distortion that happens once every week or so, with what appears to be an airship leaving the city and landing at a cloaked location I can't observe. Whatever it is, it works like clockwork. I've encoded the coordinates in the message for you. Might be worth checking out. All the best.'