Entity of Fear
From Tardis Wiki, the free Doctor Who reference
The Entity of Fear was a god that lived in the wormhole on Phobos which created the fear that people were feeling. Kai Tobias was trying to kill it by creating pure fear. Because of the euphoria of the Eighth Doctor saving people, it managed to break through a possessed Eris. The Doctor showed his fears to it, and it didn't believe they were true. (AUDIO: Phobos)
