Like the 3D civil war storyline, this is an outline for what occurs if the new narrative is activated after the main Skyrim quest is completed.
A courier mistakenly delivers a package to the player character, intended for someone else. After locating the intended recipient and delivering the package, it's revealed that the recipient is a ghost possessing unique shapeshifting powers. Upon hearing the tale of a successful hunt, the ghost gains the ability to temporarily transform into a specter of the hunted game animal.
If the player character is the Dragonborn, they can recount their dragon hunting experiences, including their victory over Alduin. If the player doesn't share this, the ghost will soon hear the tale from a wandering bard.
It remains ambiguous whether the resulting specter of Alduin is genuine or an imitation.
Surviving the ensuing debate rewards the player with the ability to freely manipulate the parameters of the 3D Civil War.
This is meant to delve into the dichotomy of Alduin and Akatosh and related lore.
In future versions, early branching into this narrative is being considered, particularly if the player is not the Dragonborn. Encountering the specter before dragons appear shows off its shapeshifting abilities for wild beasts. Certain characters, aware of both the specter and the Dragon Prophecy, foresaw the events and devised a plan to exploit them, but they underestimated the specter's potential.