Great Black Eye

The Great Black Eye, (PROSE: The Adventuress of Henrietta Street, The Domino Effect, The Gallifrey Chronicles) also known as the sun-god of the Babewyn and called the Opposition by Sabbath Dei, (PROSE: The Adventuress of Henrietta Street) was a powerful and fearful force which watched the post-War universe from somewhere outside of time. (PROSE: The Adventuress of Henrietta Street, The Gallifrey Chronicles)

At the end of the conflict between tigers and humans on Hitchemus, a hole briefly appeared in the clouds which "looked like an eye in reverse, blue pupil and black iris," staring down at the climactic events. (PROSE: The Year of Intelligent Tigers) In a mirroring of Pablo Picasso's Guernica, a blazing eye watched over the destruction of the System, illuminating the chaos as the System blackened and fell to greyness. (PROSE: History 101)

The Oracle witnessed the Great Black Eye as one of the terrifying creatures outside of reality, and believed this Eye was what was forcing many powerful forces, such as the Oracle, (PROSE: The Domino Effect) Time Wraiths, (PROSE: The Slow Empire) and clock people, (PROSE: Anachrophobia) to flee the Time Vortex. It believed that the collapse of the multiverse and the vortex would fracture the barriers which normally kept the Black Eye from interacting with normal reality. When the Oracle met the Eighth Doctor, it knew that he had seen the Eye before and tried to make him remember the horrific nature of the Eye so that he would support its plan. (PROSE: The Domino Effect)

By one account, the black eye belonged to a Dalek which watched, waited, and planned somewhere beyond the Time Vortex and the multiverse, monitoring reality for what seemed like forever. (PROSE: Sometime Never...) In the post-War universe, the Eighth Doctor had several glimpses of Daleks at the edges of his adventures. (PROSE: Father Time, The Last Resort) After the destruction of the Council of Eight, the Dalek began tracking Soul and Zezanne as they fled with the star-kiler and became stranded in London 1963. (PROSE: Sometime Never...) The equivalents of Soul and Zezanne in the prior main timeline notably attracted Daleks to London 1963 when they brought the a star-killing weapon there. (TV: Remembrance of the Daleks)

By another account, the great black eye belonged to the Master who watched over the universe with god-like power from within the heart of the TARDIS. (PROSE: The Gallifrey Chronicles)