A King's Tale: Final Fantasy XV is a 2D, side-scrolling brawler set 30 years before the events of Final Fantasy XV. It was revealed during the Square Enix Active Time Report at E3 2016, and it released alongside its companion game on November 29, 2016 as a pre-order bonus exclusive to GameStop and EBgames in North America, GAME in the United Kingdom, and Saraiva in Brazil. The game was later released as a free download for all on March 1, 2017.

The player progresses through a series of stages in which hordes of monsters and daemons must be defeated. As Regis Lucis Caelum, the player can string combos together, juggle enemies in the air, and use magic.

Regis can summon an ally whenever his combo count reaches 8, and he can use Armiger whenever it reaches 24. If he summons an ally before using Armiger, they will join the attack. If all three allies are summoned before Armiger, they will execute the powerful Bonds of Battle.