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Assassin's Creed Black Flag Resynced preserves the core story of the original while adding new material and revising select scenes. The additions were written by Darby McDevitt, who served as lead writer on the 2013 game, giving the new content direct continuity with the original voice of the story.

New and Amended Scenes
McDevitt wrote two entirely new scenes and one amended scene for Resynced, for a total of three scenes that are different from their original counterparts. These additions were designed to fill gaps, deepen character relationships, and give certain story beats more resonance within the rebuilt game.
The Caroline Scene
One of the two new scenes features Edward's wife Caroline. In the 2013 original, Caroline's role in Edward's backstory was conveyed largely through letters and references rather than direct story moments. The new scene in Resynced gives their relationship a more immediate presence in the narrative, adding emotional grounding to Edward's motivations early in the story.
Expanded Historical Figure Storylines
The relationships between Edward and the historical pirates he works alongside receive expanded treatment in Resynced. Blackbeard, Stede Bonnet, Anne Bonny, and Charles Vane all have more developed storylines compared to their original appearances, with greater narrative weight given to their partnerships and conflicts with Edward.
Matt Ryan's New Recordings
Matt Ryan, returning to voice Edward Kenway, recorded entirely new lines for Resynced rather than reusing audio from the 2013 game. This covers both the new scenes written by McDevitt and a full re-recording of the existing dialogue to match the rebuilt performance and updated engine capabilities.
Replaced Modern-Day Sequences
The original game's modern-day sections took place at Abstergo Entertainment, where the player acted as an anonymous employee within the corporation. These sequences have been removed entirely from Resynced. In their place, the modern-day story is told through optional rifts hidden across the Caribbean, a system that draws on the Animus Hub framing used in the studio's recent work.
Rather than pushing the modern-day narrative front and center, the rifts function like secrets that players actively seek out. Each one presents a "What If?" scenario exploring an alternate version of Edward's life, for example a path where Edward chooses greed over his relationship with his wife. The framing makes the modern-day layer more narrative-driven and optional than the original office sequences, which the development team noted some longtime fans were fond of.
New Endgame Missions
Resynced adds eight new endgame missions that continue the story after its original conclusion. These missions pit Edward against Robert Miller, a historical pirate hunter, and add further texture to Blackbeard's arc, including how and why his story ends the way it does. Together with the new and amended scenes, this is the bulk of the roughly six hours of additional content the remake introduces.