Nocturnal is the Daedric Prince of the night and darkness. She's also known as the Night Mistress.
She has a major influence on the Thieves Guild in Cyrodiil. The Thieves Guild of Cyrodiil's leader, the Grey Fox wears a helm called the Grey Cowl of Nocturnal. The cowl is enchanted with a spell so powerful that it actually removes the wearer's identity from history; meaning that anyone who sees the wearer without the cowl won't remember that person later on. This is one of the reasons why Thieves Guild members end each conversation with "Shadow Hide You".
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