The Affairs of Hagravens

Walkthrough
This quest begins the Dragonborn finds a caged hagraven named Melka just inside Blind Cliff Bastion. She explains that she has been imprisoned by another hagraven, Petra. If the Dragonborn releases her, she promises a reward and asks for help killing Petra.

She is a very useful guide through the area, showing the Dragonborn how to avoid all the traps along the way and fighting against any Forsworn.

Kill the Hagraven Petra
Once Petra has been found, it is a relatively straightforward fight, after which the Dragonborn can demand the promised reward from Melka.

Bugs
In the PS3-Version of that game, this quest cannot be finished, although the hagraven Petra was killed.

Die Affairen von Hexenraben