Dalek (Hell Bent)

A Dalek attempted to gain access to the Matrix hidden underneath the Capitol on Gallifrey during the Cloister Wars. It was attacked by the Cloister Wraiths, where it became a part of the Matrix hard drive, being "filed". It was encountered by the Twelfth Doctor and Clara Oswald whilst they travelled through the Cloisters, where it begged to be exterminated, hinting at the pain and anguish it was in. (TV: Hell Bent)