Nyx (Ancient Greek: Νύξ, "night") – Nox in Latin translation – is the Greek goddess (or personification) of the night. A shadowy figure, Nyx stood at or near the beginning of creation, and was the mother of other personified gods such as Hypnos (Sleep), Charon, and Thánatos (Death). Her appearances in mythology are sparse, but reveal her as a figure of exceptional power and beauty - even Zeus himself avoids provoking her 'maternal' wrath.
She is found in the shadows of the world and only ever seen in glimpses. In Hesiod's Theogony, Nyx is the daughter of Chaos, and sister of Erebus (Darkness). With Erebus, Nyx gives birth to Aether (Upper Air and Light), and Hemera (Day). Later, on her own, Nyx gives birth to Thanatos (Death), Hypnos (Sleep), the Oneiroi (Dreams), the Hesperides, the Moirai (Fates), the Keres, Nemesis (Indignation, Retribution), Apate (Deceit), Geras (Old Age), and Eris (Strife) and others. In his description of Tartarus, Hesiod locates there the home of Nyx and the homes of her children Hypnos (Sleep) and Thanatos (Death). Hesiod says further that Hemera (Day), who is Nyx's daughter, left Tartarus just as Nyx entered it; when Hemera returned, Nyx left.
In the Iliad, Hypnos, the minor god of sleep, reminds Hera of an old favor after she asks him to put Zeus to sleep. He had once before put Zeus to sleep at the bidding of Hera, allowing her to cause Heracles (who was returning by sea from Laomedon's Troy) great misfortune. Zeus was furious and would have smitten Hypnos into the sea if he had not fled to Nyx, his mother, in fear. Homer goes on to say that Zeus, fearing to anger Nyx, held his fury at bay, and in this way Hypnos escaped the god's wrath.deities, therefore she fought during the great war of the Primordials. As Nyx has not made a direct appearance in the series it is difficult to determine if she survived the primordial war or not, although there was a gargantuan statue of her through a portal (leading to another dimension, probably) at the Statue of Apollo where she was seen giving light during the Trials of Archimedes.
- She is an extremely powerful goddess, being one of the Primordials. She is so powerful and terrifying, that even Zeus, King of the Olympians, feared her 'maternal' wrath.
- Umbrakinesis: As the goddess of night, she has divine authority and absolute control over shadows and darkness so like her brother, Erebus.
- In June of 2006, the International Astronomical Union named one of Pluto's moons Nix in honor of the Greek goddess. They spelled it with an "i" because there was already an asteroid with her namesake.