The listing, Assassin's Creed IV Black Flag & Unity for Xbox One has ended.
***********These games are for XBOX ONE**********
ASSASSIN'S CREED IV BLACK FLAG:
The story is set in the early 18th century Caribbean during the Golden Age of Piracy, and follows notorious pirate Edward Kenway, grandfather of Assassin's Creed III protagonist Ratonhnhaké:ton, who stumbles upon the conflict waged by the Assassins and Templars.
Unlike previous games, gameplay elements focus more on ship-based exploration in the open world map, while also retaining the series' third-person land-based exploration, melee combat, and stealth system. Multiplayer also returns, albeit with only land-based modes and settings.
Game is rated M (Mature 17+) for Blood, Sexual Themes, Strong Language, Use of Alcohol and Violence
ASSASSIN'S CREED UNITY:
Set within Paris during the French Revolution, the single-player story follows Arno Dorian in his efforts to expose the true powers behind the Revolution.
The game retains the series' third-person open world exploration as well as introducing a revamped combat, parkour and stealth system. The game also introduces cooperative multiplayer to the Assassin's Creed series, letting up to four players engage in narrative-driven missions and explore the open-world map.
Game is rated M (Mature 17+) for Blood and Gore, Sexual Themes, Strong Language, Use of Alcohol and Intense Violence
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I apologize for the poor "descriptions". I have never played either game and know nothing of them. The descriptions I used are from Wikipedia.