The Enigma

The Enigma was a race that existed in a different dimension, which had no concepts that the main dimension had.

The Enigma could create illusions such as "Shadow Daleks" and alter timelines. The Daleks used the Enigma to erase the Time Lords from history replacing with the Daleks. It took Leela to cominicate with the War Doctor and Ollistra. Ollistra asked it to destroy the Daleks instead, whilst the Doctor requested it remove both the Time Lords and Daleks for the history to end and prevent a possible future Time War. The Enigma ultimately decided to do neither. (AUDIO: The Enigma Dimension)