Final Fantasy XV: Assassin's Festival

Final Fantasy XV: Assassin's Festival is a free downloadable content event for Final Fantasy XV in collaboration with Ubisoft's Assassin's Creed series. It runs between August 31, 2017–January 31, 2018. The event features gameplay from the Assassin's Creed series (such as stealth and climbing segments), mini-games (such as chocobo racing and "whack-a-cactuar"), and a chance to obtain exclusive items, such as the "Medjay Assassin's Robes" attire for Noctis, Gladiolus, Ignis, and Prompto. If the player has the Dream Egg obtained from the Moogle Chocobo Carnival (which will be running till late September), the player can unlock the "Master Assassin's Robes" attire for Noctis.

The collaboration was revealed in Gamescom 2017 on 24th of August.

Trivia

 * Final Fantasy series has previously collaborated with Assassin's Creed in Final Fantasy XIII-2, where Ezio's outfit is a DLC costume for Noel Kreiss in the console versions.