"I don't know," the Doctor replied, honestly. "The whole Time War was blocked from Time, but so was the Dark Times. Everything that happened while the Death Zone was open was considered forbidden, and knowledge of it was Forbidden with an capital F. Which means someone probably had knowledge of it somewhere."

He walked and talked, deftly avoiding the occasional serpent or spiked claw that jutted out of the rock face as they did.

"This is an age right after Rassilon, widely considered the most influential Time Lord in the whole of Gallifrey's history. Time Lords weren't fully in control of their telepathic skills, it's no real wonder I can't feel them out there." He looked up to the murky sky. "And they are. They're watching us like mice in a cage."