The player party—Noctis Lucis Caelum, Gladiolus Amicitia, Ignis Scientia and Prompto Argentum—ride the Regalia on top of a "wave" bursting from the Citadel imposed on a red moon or sun. The various creatures appear to be mostly daemons, some of which appear as enemies in the game, like Bomb and Arachne. Ardyn Izunia appears at the bottom with a demonic face with horns, rather than how he appears in the game. The blonde-haired woman in the arms of an armor-clad winged warrior could be an Oracle and Bahamut. On the right, some of the figures resemble the Astrals Titan, Leviathan and Shiva.
The name of the artwork, Big Bang, implies it would depict the creation of the world. According to legend Eos was created by a race of beings that descended from a higher plane, which might be depicted in the artwork as some of the unknown characters. The six Astrals are said to have formed a key part in this creation process: Titan the god of earth, Ramuh the storm god, Leviathan the sea goddess, Shiva the goddess of ice, Ifrit the god of fire, and Bahamut the god of light. The mysterious beings retreated from the world, while the Astrals would remain.
A 3D animation of the artwork was created for promotional footage. The music is called "Somnus Ultima", and is the ending music for Final Fantasy XV. "Big Bang" was also made into a PlayStation 4 theme available for those who got the digital deluxe version. The artwork is also available as a skin for the player's car in Final Fantasy XV as a reward from Totomostro.
Big Bang was the event that led to the formation of the universe, according to the prevailing cosmological theory of the universe's early developmentThe