Elemental Shade

The Elemental Shades were a type of living shadows. In the 1970s, an Elemental Shade escaped the Howling Halls and was tracked by the Tenth Doctor to the home of Elton Pope and his mother. It managed to kill Elton's mother before the Doctor could stop it. (TV: Love & Monsters)

Another type of Shade, a Quantum, was allied with Me and killed Clara Oswald in 2015. (TV: Face the Raven)