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Territory - forest
2) Rampart. This is also an old acquaintance. Race - Elves. Troops - fairies, dancers, archers, druids, unicorns, ents, green dragons.
Fairies, dancers... It smells like Heroes of Might and Magic 5.
6) Nexus. A castle of the race of blue-skinned alien invaders who adore the cold. In design and in terms of ideas for troops, it was based on the StarCraft Protoss. Perhaps the main race can also be called that for now - Protoss. The castle is essentially a spaceship that crashed on the planet and is supported by the energy of crystals. Troops - probe, legionnaire, dragoon, templar, fanatic, destroyer, archon. Territory - snow, tundra.
Again, I don't understand why there is technology in Heroes.
2) Necropolis. Undead. Troops - skeleton, zombie, ghost, vampire, lich, dark knight, dracolich. Territory - wasteland.
4) Dungeon. The same Dungeon, but with Drow in the main positions. Troops - scouts, beasts, lizard riders, manticores, witches, chimeras, twilight dragons. Territory - dungeon.
And where are the Troglodytes? Harpies? They are an integral part of the Dungeon :)
The Castle needs to be not just "humans", but something more specific and politically correct.
In general, it's interesting where this idea came from :)