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 later asked it to destroy the Daleks instead. (AUDIO: The Enigma Dimension)