War Era universe

The War in Heaven had, by most accounts, a complex constantly-rewritten timeline, (PROSE: The Book of the War, The Brakespeare Voyage, et al.) although one source indicated it was completely coterminous with the infected timeline. (PROSE: The Ancestor Cell)

By some accounts, this timeline was erased from existence, (PROSE: The Ancestor Cell, et al.) although others indicated a more complex situation. (PROSE: The Story So Far..., Weapons Grade Snake Oil)

Behind the scenes
In his piece "Future" for the charity anthology Perfect Timing 2, Lawrence Miles gives temporal mechanics applicable to the future timeline seen in his novel Alien Bodies. In a Time Lord textbook, the occasion of a Time Lord discovering their own future death is discussed as creating a paradox in the Observer Effect which would violently alter the nature of time. Much as The Book of the War describes the War's timeline as being more of a shape than a linear chronology, "Future" states that the change of events which would result from this occasion would affect the "very shape of the future".