Time sensitivity Time sensitivity or time awareness , also known as witch - blood among the lesser species , was an ability possessed by individuals or species that allowed them to naturally perceive and influence the ebb and flow of time . ( PROSE : " The Book of the War " ) With training , the ability could be tuned to build complicated temporal maps , tracing the histories of multiple people to triangulate intersections . ( PROSE : " Warring States " ) When partnered with a time channeler , a time sensitive could travel along timelines . ( PROSE : " The Winning Side " , " Peculiar Lives " , et al ) Time sensitivity should have only appeared in members of the Great Houses . However , time - active biodata appeared in many other species , inspiring theories that the hybrid biodata was introduced by a single ancestor or descendant . ( PROSE : " The Book of the War " ) Among time - sensitive species are Tharil s , Jagaroth , Xeraphin , and Time Lord s . ( AUDIO : " Prisoners of Fate " ) The Tharil s time - sensitive species were highly prized by human s for their ability to navigate timeline s . Dwarf star alloy was the only substance that could hold time sensitives like Tharils ( TV : " Warriors ' Gate " ) Zero balance dwarf star alloy was the densest material in the universe , stopping anything from getting through ( TV : " Day of the Moon " ) Time Lord s could detect time sensitivity in others easily . ( AUDIO : " " ) The Unnoticed used time sensitives to alert them of the presence of time travellers or planets with time travel capability . ( PROSE : " The Book of the Still " ) Eve belonged to a time - sensitive species that was deemed a threat during the Last Great Time War and exterminated . ( TV : " The Mad Woman in the Attic " ) According to Rassilon , the Eleventh Doctor was a " Level 7 Evolved Time Sensitive " just like himself , and wondered how he was missed in the last census . ( COMIC : " The Lost Dimension " ) Time sensitives could also manifest amongst human populations . ( PROSE : " The Cabinet of Light " , " Walking to Babylon " , " Camera Obscura " , " The Parliament of Rats " ; TV : " Human Nature " / " The Family of Blood " ) Aside from certain select organisations , human s did not even partially grasp the significance of the various temporal factions for much of their history . By approximately the 51st century , humans had some awareness of Time Lord s , though representatives of that species , such as Sabalom Glitz tended to think of them as almost magical , at the same time not seeming to take them entirely seriously . ( TV : " The Mysterious Planet " ) The 51st century Time Agency has some knowledge of Time Lords and the Time War , with Time Agent Jack Harkness regarding it as " just a legend " . ( TV : " The Parting of the Ways " ) By contrast , five billion years later , Jabe , a member of another , Earth - derived species , the Forest of Cheem , seemed cognisant of the Time War and the loss created by it , in apparent contrast to the humans of that era . ( TV : " The End of the World " ) In the Humanian Era , Lassar of the Krillitane had knowledge of the Time Lords and their extinction ( TV : " School Reunion " ) , as did the Sontaran s ( TV : " The Sontaran Stratagem " ) and Rosanna Calvierri . ( TV : " The Vampires of Venice " ) Most timeship s were wary of having the " wild " biodata of non - Homeworlder time sensitives inside of them , but Compassion actually fed on it . For a time , she used an elaborate time - loop to repeatedly harvest from Cousin Octavia and Liu Hui Ying , both of whom had witchblood . ( PROSE : " Warring States " ) Despite time sensitive individuals ' ability to naturally communicate with the loa , Faction Paradox was cautious about initiating members with witch - blood , since it was far harder to sculpt their biodata to the Faction ' s requirements . However , Cousins Octavia ( PROSE : " The Book of the War " ) and Justine both possessed witchblood . ( AUDIO : " The Eleven Day Empire " ) In " " , Awaremi recognised a similarity between her bloodline and Kodomo Kami ' s witch - blood . ( PROSE : " The Book of the War " )