Time travel was the action of going backward or forward in time.
The War was fought temporally between time-active cultures, primarily the Homeworld and the enemy. (PROSE: The Book of the War) The Homeworld found it almost impossible to travel past the Frontier in time. (PROSE: The Book of the War)
Time travel was not possible within the City of the Saved. (PROSE: Of the City of the Saved...)
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