Sentry Darfal is a Nord soldier encountered in Blackreach during the quest The Coven Conundrum. He agreed to help Sister Balra in her plot to assassinate Jorunn the Skald-King but then was betrayed by her after his aid was no longer needed.
Inside the Kagalthar Ruins, you'll come across a Windhelm sentry:
- "That lying, manipulative witch! She stabbed me!"
- Who stabbed you?
- "The Reach witch, Sister Balra. We had a deal, but she gutted me.
Listen, forget about me. I made a terrible mistake. I told her how to sneak into the Palace of Kings. Now I think the Skald-King is in danger."
- What kind of danger?
- "Balra said she had something planned for High King Jorunn … said I was a loose end.
Please! I think she means to kill the Skald-King! You must save him. I never meant …. to endanger Skyrim."
Darfal succumbs to his wounds.