NCF – Extended list of Neutral creatures.

As I understand it, is this the main upgrade? I remember that in the past, for the Undead faction, you had this concept: green - standard, no upgrade; red - blood elite; and brown - plague, wild undead (alternative upgrade). Or has this concept already become a thing of the past?

Added 5 minutes later
What lore is planned for this creature in general?

This is an upgrade; I'm not sure if there will be other upgrades/non-upgrades in NCF because the history is becoming problematic, and I'll have to rewrite it.

I was inspired by folklore - the Wild Hunt.
There is a horde of ghosts that flies through the sky once a year, searching for "friends." These are Valkyries, the undead, and there will also be ghosts based on the angel model (old version).

They all have different spells, abilities, etc.

But if a plague upgrade appears, is that another Wild Hunt? What? How? Why? And who are the unupgraded units?
It's a mess, in short. It's easier with a faction - there's a country, and within it, there are, conditionally, southerners and northerners who live there, and they differ culturally or live in different conditions. But that won't work with the Wild Hunt; internal lore development is needed. But the beauty of the Wild Hunt is that it doesn't need lore - it doesn't even need a goal (but in my case, they are waiting for the fulfillment of a prophecy about a dark messiah - this separates them from the rest of the Necropolis because Aranthir is trying to cancel the prophecy as if he were Tzeentch, not a servant of Asch). They can be liches, they can be vampires, ghosts; they can live in a pocket dimension, in a desert under elemental Towers, or simply in a secret Dungeon; it doesn't matter. What matters is that they fly through the sky and collect souls once a year