Seven deaths of Davros

During the Last Great Time War between the Time Lords and the Dalek Empire, the War Doctor bore witness to the seven deaths of Davros. (PROSE: The Day of the Doctor) Davros was the creator of the Dalek race and, during the first year of the Time War, was believed dead when his command ship was destroyed by the Nightmare Child. (TV: The Stolen Earth) The War Doctor did indeed witness this event. (PROSE: The Third Wise Man)