Skull of Shadows (SoS) is a Polish mod that replaces all the factions.

Is this the same Markel at a different time, or is it his twin?

The action takes place in my Astelnair universe. Markel has spent half his life competing for the title of Prince of the Goddess of Death, and now he has only one task left: to defeat his last competitor – Lady Shaizar, her brother, and two allies in an epic battle on the border of Necropolis and the lands of the Eastern mages (the Academy).
The map already has videos, some scripts, and landscapes. The map will differ significantly in terms of difficulty, but will also depend on my astrallein.pak mod assembly.
I'm creating it inspired by the "Unicorn Empire" campaign. ;)

Added 5 minutes ago
Important: I need a mod to replace Necropolis with the Necropolis from Heroes 6 (I mean the visual of the city, I saw screenshots somewhere), the model of Ashgan the Plaguebringer from Disk 3 (I might remove him if it doesn't work), and help from a skilled video creator (I need to open a video in an editor that he can no longer see).