Excerpt from Awakening: A Historical Recount of the Second Plegia-Ylissian War, The Valmese Invasion, and the Campaign on Grima. From chapter, "Outrealms".
The Outrealm Gate is an ancient gateway located on an island twenty leagues south of the Ylissean continent's southernmost shoreline. It is unknown what time period it was constructed in or the civilization that was responsible for building it, but it has been confirmed to be well over several millennia old.
The Gate worked by puncturing a hole in a weak segment of the fabric of space-time. During the centuries that it was operational, time flowed nearly six milliseconds slower whilst the space around the Gate was slightly jarred and distorted. It is unknown why this phenomenon occurred, nor can anyone say the Gate caused the temporal anomaly or vice versa.
Stepping through the punctured hole the gate provided would lead the traveler into a "behind the curtain" pocket dimension, from which several thousand alternate realities could be accessed. Traveling backwards one thousand years in time was as simple as walking several hundred yards, while accessing an entirely different—yet similar—dimension was as easy as stepping through another doorway inside the Gate.
Existence of the temporal anomaly also allowed for Naga to send Lady Lucina and her twelve companions through time to alter the course of history. Some reports have also stated that Lord Inigo, Lord Owain, and Lady Severa disappeared through the Outrealm Gate shortly after the fall of Grima, but historians are generally mixed on this subject.
Through rigorous testing, prolonged exposure to the space-time anomaly was known to cause vivid hallucinations, feelings of dread, and paranoia. After many Outrealm-travelers were discovered to have gone insane, travel to the island was barred save for royalty and scientific researchers.
Around two hundred years ago, the Outrealm Gate suddenly ceased to function, and time began to flow normally on the island. The reason for the disappearance of the anomaly baffled researchers up until recently. It was soon discovered that a spatial shift had occurred, moving the location of the anomaly to a widely-disputed location. It is speculated that the rift may reside from as close as above the ocean northwest of the island to as far away as the continent of Valm. Theoretically, it would be possible to restore access to the Outrealms by building another gate around the new location of the anomaly, but the methods used in constructing the original have yet to be reproduced.
The site of the original gate had been deemed safe and tourism is once again allowed. The Ylissean village of Southtown currently manages all travel to and from the Outrealm Isles, overseen by Ylissean Exalt Spes and Ylisstol royalty.
The chapter continues on for several pages, with plenty of graphs and mind-numbing statistics. There's certainly nothing of interest beyond this point.