Illyria is a fictional character created by Joss Whedon for the television series Angel. The character is portrayed by Amy Acker. She is a regular during the last third of Season Five, after she possesses Fred Burkle's body.
Illyria is one of the legendary Old Ones, an original pure demon from the Primordium Age who ruled territory including modern-day California. She was one of the most feared of all the Old Ones and ruled from her citadel, Vahla ha'nesh, which corresponds to modern-day Los Angeles. However, Illyria was defeated and murdered by her many rivals.
As depicted in an illustration of a statue of her in Vahla ha'nesh, Illyria's original form was monstrous. Illyria had five tentacle on either side of her torso which she used like arms, which were flexible and dexterous to the point she could clutch and operate weapons with them. She had two claw-like feet that allowed her to perch, much like an eagle. The rest of Illyria's form is obscured by armor, but her humanoid shape suggests that her head and torso are in much the same configuration as a human's.
Illyria was loved and feared as few of the Old Ones were, so much so she still had followers and acolytes in the modern day arguably millions of years after her reign. When the Old Ones lost their claim over this world, Illyria's essence was placed in a stone sarcophagus, her powers drained and placed in jewels embedded on her coffin. Her sarcophagus was placed in a mystical graveyard known as The Deeper Well along with the coffins of other Old Ones. A warrior of good and his army were assigned to guard the Deeper Well to prevent anyone from extracting one of the coffins, as Old Ones are capable of resurrection. In the 20th century, the Keeper of the Deeper Well was Drogyn the Battlebrand.
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Official Site: 20th Century Fox Television
Links: Illyria Wikipedia page Angel Wikipedia page Angel imdb page