Day of Reckoning (Final Fantasy XIII)

The Day of Reckoning is an event mentioned in various forms within the Final Fantasy XIII trilogy. It is either an alternate name for the time when Etro's Gate was opened, or, more likely, the title given to the time when the god Bhunivelze would enter the Unseen Realm and fight his mother Mwynn (for which the great Arks were constructed by the Pulse fal'Cie).

The event is first specifically mentioned in the Datalog for the Coliseum, where it says that its combatants will be trapped within there until the Day of Reckoning, when they would join the battle between Bhunivelze and Mwynn.