Interesting concept on a recently recorded episode of Doctor Who (a show with the concept of parallel worlds): the space between worlds is a void – completely and utterly empty.  “Many people call it hell.”

Seems like an interesting idea for the campaign.  Perhaps its something that players need to worry about – if an Everett Transfer goes wrong they could be lost in the void forever.  Perhaps its something that the natives of Altaerra know about as well – what D&D has long called the ethereal plane…accessible by their spells.

A cool adventure would be to have the player’s rescue a famous former player “lost” in the void by using magic on Altaerra to travel to there and retrieve him or her…