Nora West-Allen had a journal in which she recorded knowledge about the Negative Speed Force.


Presumably, Nora brought her journal with her to the past in order to record events using the time language, and she also secretly used it to communicate with Eobard Thawne, who was imprisoned in the future.[1]

After the death of the Speed Force, Barry Allen and Team Flash decided to use knowledge from Nora's journal to create a new Speed Force.[1][2]


The Flash

Season 6


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