Nephthys

Nephthys is the goddess of mourning and lamentation, sleep, and the night; a freind and protector of the dead. She was born on the Fifth Demon Day as the twin sister of Isis. In a later life, she married her former brother Set and became the mother of Anubis.

Background
Nephthys was originally born to Geb and Nut with her elder siblings Horus, Isis, Osiris, and Set. She was later reborn as Set's wife and Horus's aunt. She eventually had a child with him, Anubis, but gave him to Osiris to raise. When Set tricked Osiris and trapped him and attempted to kill Isis (as well as an unborn Horus), Nephthys attacked Set to protect her sister and nephew, much to Set's annoyance. After Set cut up and scattered Osiris's body, Nephthys helped Isis and Horus find the pieces. Anubis then helped put Osiris's body back together using mummification and Isis used her magic to bring Osiris partially back to life. She later helped Horus fight against Set to avenge Osiris's death.

The Throne of Fire
Nephthys is seen when Carter wakes Zia at the Nile. She does not flicker at water like other gods do due to the fact that she is a water goddess. Instead, she appears very strong and healthy. Nephthys apologizes to Carter for taking Zia as a host, which caused her imprisonment. She also informs him to protect her, for she will play an important role in defeating Apophis. After Carter asked what she meant, Nephthys melted in the form of water into the Nile, and Bes says that the Nile was where she belonged, and that it was her "true" body.

Personality
Bast notes that she is unpredictable, but little is truly known about her. Nephthys seems to care for her sister, risking Set's wrath by helping Isis escape when he attempted to kill her. Set tells Zia's shabti, thinking it is Nephthys, that in one life, she was his treacherous sister, and in another, his treacherous wife. This is probably because she sided against Set who was not really evil but warm hearted inside.

Appearance
Nephthys herself has only been described as 'slender'; since her reawakening, she presumably has kept Zia's appearance while possessing her. When she left Zia's body, she was described as having long black hair and regal features, like Isis, but with kinder eyes and gentler smile. She was dressed in a blue dress and a silver Egyptian crown.

Powers and Abilities
Nephthys's powers and abilities remain unknown, but as a river goddess she can communicate through rivers, particularly if she has a connection with the one she is speaking with. She is assumed to have all the standard powers of a god. Since she is a water goddess, she can probably control water, as she encased Zia in a sacophagus made of water while hosting her to protect them both. Running water, unlike to most gods, doesn't affect Nephthys as when Carter says she was glowing with a blue aura of power and how she was an exception about the whole running water thing, since it seemed to give her power. Set says she is the weakest of the Demon Days gods, though it remains uncertain if it was true or not.

Relationships
Set: Although there seems to be some mutual love between the two, they do not always trust each other. Nephthys has sided against her husband more than once and likewise, Set was willing to sacrifice her to gain power. However, seeing as he told her his secret name, it is likely that he cares more for her than he leads on.

Isis: Nephthys seems to love her sister very much, even willing to attack Set to protect her. She was later willing to help Isis and Sadie fight Set and keep him from destroying North America.

Anubis : Nephthys is estranged from her son, but it appears they at least are amicable towards each other, as Anubis asks Sadie to trust Nephthys.

Trivia

 * The Greek version of Nephthys is Persephone as the greek version of Set is Hades. Because Hades is married to Persephone and Set is married to Nephthys, the greek version of Nephthys is Persephone.