An ulterior world was one made not out of matter, but concepts and ideas.

The Celestis home of Mictlan was an ulterior world. They sometimes used meme-mines like the GCI Processor to enhance their ulterior world when dealing with the rest of the universe. An early example of the connection of an ulterior world to Earth was caused by Vlad III's mass sacrifice in Tirgoviste in the 15th century.

Other examples of ulterior worlds were the Eleven-Day Empire and the Thirteen-Day Republic. (PROSE: The Book of the War)

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