Hermaeus Mora (or Herma-Mora) is the Daedric prince of knowledge, sometimes called the Demon of Knowledge, whose sphere is the scrying of the tides of Fate of the past and future. Unlike most Princes, Hermaeus Mora does not take on a humanoid form, but appears instead as a grotesque abomination: he is a green mass or void of tentacles and eyes.
Apocrypha is Hermaeus Mora's plane of Oblivion—a virtually endless library where all forbidden knowledge can be found. Hermaeus' grasp of tentacles constantly breach the murky dark waters. Seekers and Lurkers serve Hermaeus Mora by guarding the secrets of the Black Books.
For more information, see the lore article.