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 Academy Castle into a dark Alternative version? Heroes of the Death Knights.
Creature upgrades:
1. Ghoul - Vampire - Dread Bat
2. Ghast - 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. Witch - Sorceress - Banshee
5. Acolyte - Necromancer - Dark Magister
6. Butcher - Ogre - Behemoth
7. Bone Dragon - Ice Dragon - Ice Serpent.

Is it possible to bring this mod to life?

I like the idea, but only partially. In my opinion, the Undead city from Heroes of Might and Magic III is not needed by anyone in the Heroes series. Especially ridiculous would be the Ogres and Ice Serpents. Butchers wouldn't fit in, but they would too obviously resemble Warcraft, and in the case of the serpents...

Downgrade - Bone Dragon, upgrade - Ice Dragon... so, an unupgraded building for hiring - a Dragon Graveyard, an upgraded one - a Dragon Morgue (since they are covered in ice there)? And what is the difference between an Ice Dragon and an Ice Serpent if both are based on the Bone Dragon?