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Well, I have an idea/concept.
What if we create "guardians"? Each Faction would have one guardian, who would have a good arsenal of spells, and their focus would be on supporting the army, like a hero's magical support assistant.
Let's break it down with an example. Let's say it's a "Master Lich." I'm warning you, all the parameters are chosen randomly; this is just a general idea for now. The idea is that it should be powerful, expensive, durable, and not very strong, but still useful.
So, the Master Lich for Necropolis (5 upgrade levels):

Level 1:
200 HP
10 attack
10 defense
4 speed
10 initiative
10-10 damage
Spells of levels 1-3 at skill 0.
10,000 gold.
Level 2:
500 HP
15 attack
15 defense
5 speed
11 initiative
15-15 damage
Spells of levels 1-3 at skill 1.
+Blind at skill 0
30,000 gold
Level 3:
1000 HP
20 attack
20 defense
6 speed
12 initiative
20-20 damage
Spells of levels 1-3 at skill 2.
+Blind at skill 1
+Berserk at skill 0.
50,000 gold
Level 4:
1500 HP
25 attack
25 defense
7 speed
13 initiative
25-25 damage
Spells of levels 1-3 at skill 3.
+Blind at skill 2
+Berserk at skill 1.
+Charm at skill 0.
+Vampirism at skill 0.
70,000 gold
Level 5:
2000 HP
30 attack
30 defense
8 speed
15 initiative
30-30 damage
Spells of levels 1-3 at skill 3
+Blind at skill 3
+Berserk at skill 3
+Charm at skill 1
+Vampirism at skill 1
100,000 gold
It would be necessary to assign 5 creature IDs to it; essentially, each upgrade is a different creature. Creating a new skin for each level would be too much; if there were a huge team, it would be possible, but as it is, at most, one model could be modified, and an effect added (I even know a cool one with flying bats). And the levels on the creature icon could be displayed in Roman numerals.
I don't know how it will work because I've never given creatures Charm, Vampirism, or Blind.
And again, all the stats and the price are preliminarily invented.
What do you think of this flight of fancy? 😄