Because a trilogy only consists of three games, "Quadrilogy" releases usually add a fourth piece of media to complete the narrative arc. Depending on how the repack author compiled the bundle, the fourth item is typically one of two things:
Match the MD5 or SHA-256 checksums of the installer files against official community database logs to ensure the files haven't been tampered with. Assassins Creed Ezio Quadrilogy-ZAZIX VERIFIED
An older Ezio traveling to Constantinople to uncover the secrets of Altaïr Ibn-La'Ahad. Why "Quadrilogy"? Because a trilogy only consists of three games,
While not a playable game, Embers is the essential fourth pillar of the "Quadrilogy." This short animated film depicts Ezio’s final days. It provides a poignant, emotional closure to his story, showing the legacy he left behind and the peace he finally found after decades of war against the Templars. The ZAZIX VERIFIED Experience Why "Quadrilogy"