Aranea Ienith

 is a priestess of Azura in The Elder Scrolls V: Skyrim. Alone, she protects the Shrine of Azura outside of Winterhold. She descends from the Dunmer cult that worshipped Azura sometime before the eruption of Red Mountain. When the Dragonborn visits the Shrine, she sends him or her to search for the stolen Azura's Star. The Dragonborn cleanses the artifact upon his or her return by entering it and killing the souls within. Afterward, Aranea offers to become a Follower. During battles, she casts Oakflesh and Ice Spike.

Bugs

 * Aranea may attack unprovoked and refuse to yield if the player has a bounty, making the quest The Black Star in-completable. Clearing the bounty and re-approaching her may fix this.