Nocturnal

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Nocturnal is the Daedric Prince whose sphere is the night and darkness. She is also known as the Night Mistress and "Lady Luck". The Cyrodilic Thieves Guild leader, the Gray Fox, has the Gray Cowl of Nocturnal, which truly represents the sphere's darkness quality; it permanently removes the wearer's specific identity from all history. Regardless, the Cyrodiil Thieves Guild venerates Nocturnal by ending talks with the saying "Shadow hide you." The summoning date of Nocturnal is 3rd of Heartfire.
Nocturnal and Azura have been referred to as sisters, though whether in the literal or the metaphorical sense is unknown.