Temporal exclusion zone
Observed by most time sensitive species, a temporal exclusion zone covered the Dark Times of the early universe. (PROSE: Dalek Combat Training Manual [+]Loading...["Dalek Combat Training Manual (reference book)"]) The Dark Times had been timelocked by Rassilon, who declared the "time before the Time Lords" to be off-limits. However, the Dark Times were accessible through the Time Fracture, which was created when the Tenth Doctor changed the fixed point in time of Adelaide Brooke's death, leading to the Kotturuh crisis. (PROSE: What the TARDIS thought of "Time Lord Victorious" [+]Loading...["What the TARDIS thought of \"Time Lord Victorious\" (short story)"])
During the Last Great Time War, the Time Lords' scrutiny of Dalek history brought forth a range of sources providing "recent intelligence" that indicated the Dalek Time Squad had somehow managed to enter the Dark Times, at the periphery of the temporal exclusion zone. (PROSE: Dalek Combat Training Manual [+]Loading...["Dalek Combat Training Manual (reference book)"])
Even during the Darkest Days of the Time War, it remained impossible for the conflict to enter the Dark Times of the universe, with no one managing to break through the barrier surrounding those earliest days of the universe. (PROSE: Secrets of Time Lord Victorious [+]Loading...["Secrets of Time Lord Victorious (short story)"])
