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For Humans, you can create a supply wagon (+1 morale).
For Dwarves, a steam engine that creates a smoke screen during battle (-10% effectiveness for enemy archers).
A terrifying totem for Necropolis (-10% enemy initiative).
For the Shadow League, an all-seeing eye that suppresses enemy unit abilities with a 20% chance (e.g., an Ent will not be able to entangle with roots).
A cage with sinners for the Inferno – their moans and cries are so terrifying that the luck of all troops is reduced (-1 luck).
An Elven idol adds 2 speed and 1 initiative, which will be useful for Elves.
A sphere of the sun for the Academy. This item is very deceptive; it brings 250 gold to the treasury and creates a golden shield (all the player's money is converted into health during the battle and distributed among the participants, including war machines; the maximum shield is no more than 1000, however, there is a downside: when the golden shield is damaged, the money is also lost, so even at the beginning of the game, the sphere is more likely to be a disadvantage than an advantage. But at the end, who wouldn't want an extra thousand HP?