Why the sixth one? The skeleton in the seventh one is a skeleton, but the textures in the sixth one for the undead are either more greenish or more whitish.
Posts from RTF is a global modification that replaces all towns in the game.
Do we need Ashan?
The skeleton turns into a dried-out zombie! I actually like it even more this way.

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
it was decided to change the undead armor to Byzantine/Russian style; I've wanted to use Byzantine armor for a while, but for warriors of a different faction.
the undead would be ancient, and the Academy would be Byzantine, but the city of the Academy is too Arab-Indian in style, so I abandoned the idea.
the dwarves and cultists wear European armor because these two peoples live in a fragile peace across the sea and exchange technologies. The Fortress faction are outcasts and liberals who lost the civil war and fled across the sea. They lost because the cultists made a deal with the conservative nobility – independence and power over the surface in exchange for military assistance.
the remaining factions will be based on other real peoples or will go into full fantasy (like the chaos dwarves).
it was decided to replace the undead armor with Byzantine/Russian armor; I've wanted to use Byzantine armor for a long time, but for warriors of a different faction.
the undead would be ancient, and the Academy would be Byzantine, but the city of the Academy is too Arab-Indian, so I abandoned the idea.
the dwarves and cultists wear European armor because these two peoples live in a fragile peace across the sea and exchange technologies. The Fortress faction are outcasts and liberals who lost the civil war and fled across the sea. They lost because the cultists made a deal with the conservative nobility – independence and power over the surface in exchange for military assistance.
the remaining factions will be based on other real peoples or will move into full fantasy (like the chaos dwarves).

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
I personally really like the visuals!
For now, I've called this undead "revenants," but "undead" might be a better fit, although that term is already in use.
The name "zombie" isn't quite right either, because this is intelligent undead. I based the concept on Skyrim's draugr – they're not very bright, but they can still speak, use magic, and so on.
It won't work with a separate unit (I changed the file structure at some point).
TRASH
Just for fun, I ported a couple of objects from Anno 1701. I would have ported more, but there were problems with the textures, and I'm too lazy to fix them.
If anyone finds it useful, feel free to take it; I'm happy to help.
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Update
Added two versions of the Chinese house: a tea house and a watchtower (the latter without alternative versions).
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Another update
Added ruins and fortress walls. There are so many objects now that I had to replace some of the arena objects, so I don't recommend using this as a standalone mod.
Added 2 minutes later
No one has responded to the mod requests yet; it's been about 3 weeks.
Could you please share a link to the level 2 Naga, Sea Elf, and if available, a Sea Elf Warrior.
Added 2 minutes later
No one has responded to the mod requests yet, and it's been about 3 weeks.
no one answered you because no one wants to mess around in the Sanctuary.
By the way, there's only one Sea Elf; Zakhar ported it from the seventh game.
Tier 2 is probably Kappa, also Zakhar's units.
Added 40 minutes later
I mean, they have NCF versions, so dig around in them. In principle, you can just delete the files with the characteristics of unnecessary units, and that's it.
I've reverted to the style of Ashan's undead, because I'm afraid that otherwise I'll be flooded with messages asking "when will you redo the undead city?", I mean the city itself, its buildings. The same thing happened with the dwarves.
And I also don't want to lose such a huge set of models and textures; the ghost looks simply amazing (although I don't know how I'll make upgrades for it, and how I'll solve the problem that the unupgraded undead are brown, and here they are green, but it doesn't really matter).