A Varley extraction is the act of abducting individuals from the past who were destined to die, and taking them to the future. Since those individuals were going to die anyway, there would be no impact on the timeline.
The Aegis routinely used Varley extractions to add to their ranks. Aegis operatives would take individuals from the past and transport them to the Aegis homeworld, where they would be selectively trained and bred into genetically superior specimens. Their descendants would, in due course, be optimal Aegis assets. (DTI novel: Shield of the Gods)
- The term "Varley extraction" is a reference to author John Varley, whose novel Millennium features this same process.