RTF is a global modification that replaces all towns in the game.

Hello, is it possible to create a mod for an Alternative Undead faction, and redesign the Castle of the Academy of Magic into a dark Alternative version? Heroes of the Death Knights.
Creature upgrades:
1. Ghoul - Dread Ghoul - Vampire
2. Skeleton - Corpse - Death Whisper (Spiders, I noticed that there are no spiders in Heroes, although Giant Spiders exist in Fantasy)
3. Gargoyle - Amethyst Gargoyle - Lapis Lazuli Gargoyle
4. Witches - Sorceresses - Banshees
5. Acolytes - Necromancers - Dark Mages
6. Butcher - Ogre - Fat Ogre
7. Bone Dragon - Ice Dragon - Ice Serpent.

Is it possible to bring this mod to life?

Hmm... yes, it's an interesting idea. I understand that the Undead race from Warcraft 3 was taken as a basis? :)
In principle, it can be implemented, but there are a couple of problems:
1) Who will do it? Currently, almost no one has much time, and everyone is busy with their own projects ;)
2) Gargoyles look terrible in Heroes 5, and it's a question of what else they can be made into.
3) I have no idea what to make the 6th level creature. Although it might be possible to use Rakshasa, but I'm not sure.

P.S. Spiders exist in Heroes (in both Heroes 7 and Heroes 5 (although they were added using mods)). However, they are made rather poorly.
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Regarding the previous messages:
1) On the one hand, the Sanctuary is ready, on the other hand, it still needs to be polished.
We will not add it to the mod yet, because there is no point in adding an unfinished city.
2) There is no time to work on the mod right now, because some people have exams coming up, and others have a session.