Qxeleq

From Tardis Wiki, the free Doctor Who reference

Qxeleq was a student and the dronemate of Xhallaq, who were both part of the Mind on Earth in an alternate timeline. When Gabriel and Tanith brought Qxeleq to the primary Earth, Xhallaq and the rest of her people were lost to her.

Merging with others from no longer existent timelines into Justin Cranleigh, they sacrificed their lives in Cathedral to ease the universe's pain and defeat Gabriel and Tanith. (PROSE: Falls the Shadow)