Rise and Fall of the CovenEdit
It is unknown when the coven was founded, but what is known is that its members settled in Darklight Tower and preformed wicked arcane activities. When a member of the Darklight Tower Coven completed their Hagraven Trials, another member of the coven was supposed to capture a human sacrifice and kill him/her in front of the trial-passer.
When the victim was killed and some incantations muttered, the graduate would transform into a Hagraven. This grisly practice continued throughout the group's existence until a member of the coven, Illia, rebelled against the faction.
When the Dragonborn first arrives at Darklight Tower, they witness Illia killing a fellow Witch. After the witch lies dead, she starts a conversation about her mother, Silvia, who is going to be transformed into a Hagraven. If accepting Illia's offer to stop the transformation ceremony, the Dragonborn will start the quest Repentance. After the conversation, the Dragonborn assists in killing all the members of the Darklight Tower Coven, who guard the way to the ceremony. Once the Dragonborn reaches the top of the tower and kills Silvia, the coven is wiped out, and hence, a major threat to the land of Skyrim is vanquished.
- The Elder Scrolls V: Skyrim (First appearance)