Fabula Nova Crystallis Final Fantasy (ファブラ ノヴァ クリスタリス ファイナルファンタジー) is a series of games by Square Enix. Made in the same vein as the Compilation of Final Fantasy VII and the Ivalice Alliance, Fabula Nova Crystallis (lit. "the New Tale of the Crystal" in Latin) is based on various worlds and different characters, but each game will be "ultimately based on and expand upon a common mythos." According to Square Enix, the only connection is a "vague crystal theme".
Originally named Fabula Nova Crystallis: Final Fantasy XIII, the 'XIII' numeric was dropped after Final Fantasy Agito XIII was renamed Final Fantasy Type-0, as it did not have much to do with the game Final Fantasy XIII according to the director.