She is strong enough to fight Helios, who can destroy the World, but Helios is implied to always force her to retreat. She is an extremely powerful goddess, being one of the Primordials.This is also stated to be the case by one of the developers of the series. This may suggest that Nyx is not as powerful as in mythology, or that the Olympians are more powerful than Primordial deities. She also appears in the God of War Ascension multiplayer stage Walls of Troy, where it's stated that Helios is banishing her from the night sky.
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 at the Statue of Apollo where she was seen giving light during the Trials of Archimedes. Nyx is one of the oldest and original Greek deities, therefore she fought during the great war of the Primordials. 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. Zeus was furious and would have smitten Hypnos into the sea if he had not fled to Nyx, his mother, in fear. He had once before putting Zeus to sleep at the bidding of Hera, allowing her to cause Heracles (who was returning by sea from Laomedon's Troy) great misfortune. In the Iliad, Hypnos, the minor god of sleep, reminds Hera of an old favor after she asks him to put Zeus to sleep. Hesiod says further that Hemera (Day), who is Nyx's daughter, left Tartarus just as Nyx entered it when Hemera returned, Nyx left. In his description of Tartarus, Hesiod locates there the home of Nyx and the homes of her children Hypnos (Sleep) and Thanatos (Death). 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. With Erebus, Nyx gives birth to Aether (Upper Air and Light), and Hemera (Day). In Hesiod's Theogony, Nyx is the daughter of Chaos, and sister of Erebus (Darkness). She is found in the shadows of the world and only ever seen in glimpses. 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. 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). Nyx (Ancient Greek: Νύξ, "night") – Nox in Latin translation – is the Greek goddess (or personification) of the night.