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Fenric, also known as Hastur the Unspeakable or Aboo-Fenrán, along with the Wolf and the Hunger, was an immensely powerful sentient force that was at least as old as the universe itself and an intelligence of pure evil, later identified as a Great Old One.
NATURE AND POWERS
Fenric did have a body, one with a thousand limbs that stretched across several dimensions, (Gods and Monsters) but like many Old Ones lost it and became dependent on possessing others. He could presumably inhabit any body in any time, possibly killing the original consciousness if surpressed long enough. (Black and White) If a body became too weak, he would transfer into another. He was able to teleport and could cause lightning strikes. While imprisoned, he was still aware of events outside the Shadow Dimensions and could move people through time and space in time storms, whilst also influencing their destinies without them knowing. These individuals, who had been touched by the curse of Fenric, were known as the Wolves of Fenric. (The Curse of Fenric) He was able to control an army of Haemovores, though this was a drain on his mind, and he was able to bestoe free will onto individual creatures. (Gods and Monsters)
RELATIONSHIP WITH OTHER OLD ONES
Fenric was seen as being too dangerous, even for the Elder Gods who were capable of dying despite their great power. As Weyland’s shield gave the wearer the ability to destroy matter and change reality, Fenric sought it while the other Gods supported Weyland in his game against Fenric, with the shield as the prize. He was infuriated when he learned of the conspiracy against him. (Gods and Monsters)
Tricked by the Doctor during a game of chess during the third century, Fenric’s life essence had been trapped in a casket and abandoned for centuries.
Brought to England by the Vikings, Fenric manipulated the genetics of the Vikings, creating a long line of descendants all of whom would be loyal servants.
In 1943, Fenric was freed, having placed one of the descendants, Ace, aboard the TARDIS.
However, trapped inside a human body, Fenric was destroyed by the ultimate descendant, the Ancient Haemovore from thousands of years in the future.