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The Ebonmere is a portal to Nocturnal's plane of Oblivion known as The Evergloam. The portal is located inside the Twilight Sepulcher in Skyrim. By stealing the Skeleton Key, Mercer Frey disrupted the portal, leaving Nocturnal nearly powerless in Nirn.
- When looking straight up while in the Ebonmere, where the skeleton key was inserted, you see the full "dark moon", that is the part of the Nightingale insignia.