*We know that, at least up until 2013, Final Fantasy XV was firmly embedded in the Fabula Nova Crystallis mythos. After the reshuffle in 2013, the terminology and specific branding was removed to distance XV from the Final Fantasy XIII setting, the mythos was retained as a base for the expanded lore, which itself is based on Japanese folklore and unspecified Western mythologies. Some have stated that it was outright removed rather than repurposed, but there has been no direct quote from developers on the matter, so this point is up in the air. (
Videogamer.com,
Finaland,
Famitsu,
GameSpot, Game Informer May 2016 issue).
*The figure in the logo of Final Fantasy XV is a goddess, even referred to as the most important goddess in the world of XV, making her equivalent if not the same as Etro from XIII and Type-0. (
GameSpot)
*We know that, according to the traditions of the world, the Crystal was given to Lucis in "antiquity" by unnamed deities. They also granted the Ring of the Lucii, which is the only way to access the Crystal's power, and can only be used safely by the Caelum bloodline. (Japanese promotional pamphlet for Kingsglaive)
*We know that mysterious "beings" descended from the skies and made the world of Eos. The Archeans formed part of this creation process, and have since become a separate existence from humans related to maintaining the natural world, not getting involved in human affairs. The Archeans are also associated with the stars in some way, representing "astral power". Leviathan appears to be among the most powerful, as she is referred to as being "close to God". (
Dengeki,
Kotaku,
FF Union)
*When he was a child, Noctis had a near-death experience that marked him with some unknown destiny, referred to as being chosen by the "stars". We also know that a being connected to the unnatural Daemon monsters of Eos wanted to have him die, while the Archean Carbuncle protected him. (Platinum Demo,
"Dawn" trailer,
Famitsu)
*The world is under threat from the "Plague of the Stars" (translated Japanese term), which will plunge Eos into an everlasting night. This is countered through the blessing of Oracles, who commune with the world's deities. The power of Oracles appear exclusive to women from the royal family of Tenebrae, and Luna is the latest in that line. (
Siliconera, Japanese promotional pamphlet for Kingsglaive)