End of Time
From Jenny Everywhere Wiki
The End of Time was the era at the very end of the history of any universe with a finite lifespan, after the stars had died and before its final collapse.
In the Collapsed Cosmos, the End of Time was “dull and foggy somehow rather than truly dark”. The Archons had built the Redoubt there, being able to go back to earlier points in history using the Null-Train. (PROSE: The Hermetic Garbage of Jenny Everywhere)