Ferutu

The Ferutu were a mysterious race from an alternate universe. They invoked runes and magic to modify time itself.

History
The Ferutu came from an alternate timeline in which Gallifrey was destroyed shortly after Omega's mission to Qqaba by the return of the Machine, laden with fusion bombs. Without the Time Lords, the Ferutu took their place as the guardians of the Web of Time; unlike the Time Lords, who were content to observe and only interceded against major threats to the integrity of space-time, the Ferutu actively modified the universe to reflect their wishes. The Seventh Doctor briefly visited their universe, and declared it a utopia.

They entered the Doctor's timeline at the point at which the Machine departed, a remote colony of the Earth Empire. When the Machine failed to destroy Gallifrey, their timeline collapsed, except for a small number of prisoners shielded from the effects of the paradox. (PROSE: Cold Fusion)

A group of Ferutu invaded the Doctor's timeline (or at least Bernice Summerfield's timeline) again under the guise of the All-High Gods. (PROSE: Twilight of the Gods)

Physical characteristics
Ferutu were generally human in appearance, but completely hairless, lacking even eyelashes. They had more angular features than most humanoids. They typically dressed in long black cloaks and high-collared tunics. (PROSE: Cold Fusion)

Abilities
The power of the Ferutu lay in their ability to slow, accelerate, stop, and manipulate time. They were nearly invincible in most forms of combat; they could simply freeze their opponents and strike with impunity. They also could choose to accelerate a pocket of time around foes, causing them to die of old age.

They could also exist outside of cause and effect, allowing them to reshape history at will.

The Ferutu were capable of powerful telekinesis, allowing them to hover over the ground and kill with a gesture. They could also pass through solid matter.

They invoked their powers through the usage of runes. The amount of power they could exert correlated to the number of Ferutu invoking the runes.

The runes were also the source of their only apparent weakness; they were vulnerable to those same runes, when used properly. (PROSE: Cold Fusion)

Behind the scenes

 * "Ferutu" is an anagram of "future".