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An act of love by the last king.
- —Final Fantasy Versus XIII trailer
Take heed. Never bow out of what you begin. So long as you carry the blood royal, so long as you carry my name...carry your head high.
- —Regis to Noctis in demo's secret trailer
As a member of the Caelum family, Regis believes that being of the royal bloodline makes one strong of heart and will. As shown in the E3 2013 trailer, Regis can also be a laid back person as he ate green soup and showed his green tongue to make his son laugh while he was a child.
In the trailer revealed at the "Square Enix 1st Production Department Premiere" in January 2011, Regis is sitting on his throne, pondering and talking to himself. He is also seen facing off against a mysterious white-robed man. Regis wields a falchion with an engine attached to its hilt and has the power to manipulate weapons; they all point menacingly towards the robed man opposing him.
Niflheim's army seeks to conquer Lucis, take its crystal, and end the reign of the Caelum family. As revealed in a secret trailer in the Final Fantasy XV Episode Duscae demo and the Jump Festa 2014 trailer, Regis is said to have died, though his actual status is unknown.
Regis Lucis Caelum is a Latin phrase that may mean "Sky of the King's Light" or "Sky of the Light's King". Regis and Noctis's naming follows thus a similar theme pertaining light and sky.
- A point of clarification concerns a sequence where Regis is seated on his throne early in a trailer (before the gameplay begins) and says something along the lines of "You're not fit to be king". While many assumed this statement was directed at Noctis, it is actually directed at someone else.
- Regis's powers are similar to those of Noctis in the first few trailers of Final Fantasy XV.