but for me, the most fun is an army consisting only of heroes and a large supply of potions of immortality...
It looks impressive, but often the spirit interferes, especially if the heroes are from different Castles.
The usefulness of a unit depends on the player's tactics and the appropriateness of that unit against the opponent's unit (for example, a vampire is simply very useful against the basic army of Nature, but against golems, undead, or elementals, it clearly has nothing to do). But in any case, a pumped-up hero-mage or a hero with Warfare (tactics, and also provide troops...) will definitely not be useless in battle, and a scout and a lord are good on the map.
Well, without any hero, the army loses its strength, especially without a mage or a tactician, and it becomes similar to a neutral army, if you are playing against a strong player (i.e., you won't be able to make a proper move with the unit either)
