Daughers of Nyx, the goddess of night...
" In Greek mythology, Oizys (/ˈoʊɪzɪs/; Ancient Greek: Ὀϊζύς) is the goddess of misery, anxiety, grief, and depression. She is the daughter of Nyx, the goddess of night and the twin of the god Momos. Her Latin name is Miseria, from which the English word 'misery' is derived. She is also the younger sister of the Greek personification of the day, Hemera. She is a minor goddess without a great cult following, but a primordial goddess of misery and depression with a certain amount of mythological weight nonetheless. "
" In Roman and Etruscan mythology, Mania (or Manea) was a goddess of the dead. She, along with Mantus, ruled the underworld. She was said to be the mother of ghosts, the undead, and other spirits of the night, as well as the Lares and the Manes. Her name links her to the Manes, Mana Genita, and Manius.
Both the Greek and Latin Mania derive from PIE *men-, "to think." Cognates include Ancient Greek μένος / ménos ("mind", "thought") and Avestan / mainyu ("spirit")
In Roman and Etruscan mythology, Mania (Manea) is the Goddess of Spirits and Chaos. In Greek Mythology, she is the Goddess of insanity and madness. "
" The Maniae /ˈmeɪni.iː/ (singular: Mania /ˈmeɪniə/), in ancient Greek religion, are a spirit or group of spirits personifying insanity, madness, and crazed frenzy. They operate closely with Lyssa, the spirit of mad rage, frenzy, and rabies; and, like Lyssa, are presumed to be daughters of Nyx. They are also associated with the Erinyes, the three fearsome goddesses of vengeance.
They are also sometimes said (though, perhaps in jest, or as a metaphor for love's sometimes cruel nature) to have been nurses of the god Eros. "
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