Vultures

The Vultures are a race of near omnipotent beings that originated at the dawn of time, and were capable of removing anything from existence. They regarded the Doctor as their arch enemy, and sought revenge on him for imprisoning them.

History
The Vultures were formed at the dawn of time, along with other creatures such as the Nihil, with which the Vultures served as predators. They slowly began to develop their ability to manipulate time, and used it to cause as much chaos as possible, with only their own entertainment in mind. The Time Lords deemed them too sadistic and mighty to exist, and so planned their death, but were persuaded by the Doctor to instead imprison them in the Quantum Ark, which they escaped from after 100 years, seeking revenge on both the Doctor and the Time Lords.

They got hold of one of their ships and used it to observe the Doctor on his travels, before getting his attention by wiping both the Chendaki race and the planet Tarquan from existence. They forced the Doctor and Jess onboard their ship and revealed their plan to destroy Gallifrey. Once the Doctor and Jess escaped, the Vultures made their way to Gallifrey, wiping out their shields and setting up base in the Dark Tower in the Death Zone. They used the Time Scoop to bring in a number of enemies of the Doctor, but that didn't stop them from being defeated when two incarnations of the Doctor and Caldril, Castellan of the Time Lords, used their psychic abilities to weaken the Vultures, allowing the consciousness of Rassilon to send them through a portal to the dawn of time which they had planned to send Gallifrey through, trapping them there.

Physical Appearance
The Vultures are largely seen wearing masks resembling skulls to symbolise their gift of death. Underneath, they bear the appearance of a grinning, translucent humanoid, with a cellular membrane surrounding their head. They all wear some sort of black armour.

Powers and Abilities
The Vultures were able to remove anything from existence using their own weaponry. They also possess enough energy to create portals to other time periods, however this is only possible when multiple Vultures combine their energies at once.

Season 1 (2015-2016)

 * 1) The Doctor of Sleepy Hollow (Illusion)
 * 2) Devour (Retrospectively)
 * 3) The Cult of Blood
 * 4) The Sins of the Time Lords
 * 5) The Dawn of Time