Hermaeus Mora is a daedric prince whose sphere is the scrying of the tides of Fate, the past and future as read in the stars, and dominion of knowledge and memory. He is vaguely associated with the Morag Tong through his sibling Mephala. Hermaeus appears in the form of a green mass with tentacles and claws.
His realm is called Apocrypha and is an endless library where all forbidden knowledge can be found. All the books are black with no titles and ghosts haunt the place in a never ending search for knowledge. Only one artifact is associated with Hermaeus Mora:
Oghma Infinium: Improves multiple stats.
The daedric prince’s enemies are Ebonarm and Vaermina.
In Daggerfall the player had to assassinate a noble who displeased Hermaeus.
In Oblivion he asks the player to retrieve a soul from each race so that his followers could begin rituals to explore the realms of reality as well as space and time.