Game of Rassilon (The Five Doctors)

In order to achieve immortality, trapped four incarnations of the Doctor in the Death Zone, reviving the Game of Rassilon. (TV: The Five Doctors)

Aftermath and legacy
The Time Lords acknowledged the abduction of Daleks to the Death Zone among the acts of aggression which escalated tensions between the two species, eventually leading to the Last Great Time War. (PROSE: Dalek Combat Training Manual)

Borusa's attempt to acquire the Fourth Doctor and Romana II prematurely aborted the series of events leading to the defeat of Skagra (TV: Shada, The Five Doctors, WC: Shada, et al.) Ultimately, theorised to be a result of ensuing temporal instabilities, the event unfolded at least four times, (PROSE: A Brief History of Time Lords) with account claiming that the adventure was eventually resumed by the Eighth Doctor and Romana. (WC: Shada)