Nyx is the goddess of night. She wasn’t seen very often, just in glimpses of shadow, but those glimpses revealed her to be a a stunning beauty. She was also super powerful. Zeus was afraid to anger her, and that says a LOT, and in some myths she is the mother of all creation instead of Chaos. Nyx is also credited with giving oracles dreams and prophesies.
Nyx was daughter to Chaos, sometimes Eros, wife to Erebus, and mother to plenty of notable deities in my series (Charon, Thanatos, Hypnos, Styx, Moirai, ect). Her other children with Erebus included Aether (Brightness), Hemera (Day), Geras (old age) and The Hesperides (Evening, Sunset).
Her children without Erebus (or any god or man) are Moros (Doom, Destiny), Ker (Fate, Destruction, Death), the Oneiroi (Dreams, anyone else think of the Oni in Teen Wolf when they read that?) , Momus (Blame), Oizys (Woe, Pain, Distress), the Keres, Nemesis (Indignation, Retribution), Apate (Deceit), Philotes (Friendship, Love), and Eris (Strife). (Thanks Wikipedia).
The happy family lives in a cave in Tartarus, with the exception of Hemara who just visits every night when Nyx isn’t home, neatly explaining night and day, but leaving a lot of unanswered questions about the obvious tension between mother and daughter.