Destiny trap

A destiny trap was a type of temporal loop created by an individual or group if they tried to change a history they were a part of; as the Eleventh Doctor claimed, the trap arose because "you can't change history if you're part of it". (TV: The Time of the Doctor) Unlike a more conventional time loop, where individuals would find themselves living through the same events multiple times, (TV Eve of the Daleks) a destiny trap was a loop that created the original events the time travelers were trying to prevent in the first place. (TV: The Time of the Doctor)

As such, a destiny trap was similiar to a bootstrap paradox. (TV: The Time of the Doctor,Before the Flood) The Kovarian Chapter and its members of the Silence found themselves in a destiny trap; they tried to prevent the Siege of Trenzalore, but, because they were involved in the siege, only succeeded in making it happen. (TV: The Time of the Doctor)