Severance of Skaro
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The Severance of Skaro was a major battle fought during the Last Great Time War. Skaro was the homeworld of the Daleks, the race that fought the Time Lords in the war. The severance was later mentioned in a book covering the history of N-Space, which listed the severance between the Night of the Reborn and the Resurrection Breach. (PROSE: The Whoniverse)