What does the blessing of nocturnal do in Skyrim?

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Tags

1. #ragged
2. #returns
3. #found
4. #grant
5. #shrine
6. #points
7. #riften
8. #flagon
9. #effect
10. #nocturnal
11. #hours
12. #darkness
13. #which
14. #sneak
15. #quest
16. #increases
17. #praying
18. #after
19. #blessing
20. #cistern