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These are great ideas; I hope they are implemented in the game soon!
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If you're fighting against the Academy, use sappers; against the Sylvan, use gardeners; against the Warlock, use electricians; against the Necropolis, use gravediggers (this is all in the context of sieges):D :D :D :D
And I would create unique siege engines for each faction (for example: elves, as they don't like machines and all sorts of dark technology (see the faction description), could make an ENT instead of a catapult, which would throw stones (like a catapult against walls), and instead of a ballista, I don't know what else could be invented, etc. By the way, like in Warcraft, you could let the Necropolis use a corpse cart as a catapult!
Well, I would create individual siege weapons for each race (for example: elves - as they are not fans of machines and all sorts of dark technology (see race description), they could make an ENT instead of a catapult, which would throw stones (like a catapult against walls), and instead of a ballista, I don't know what else could be invented, etc. By the way, like in Warcraft, you could let the Necropolis have a corpse cart as a catapult!
100% cool idea! The corpse cart would throw corpses and lower morale!:D
A new unit for Haven, I hope no one has suggested it yet. A Cart with a Holy Cross. If anyone knows, in the Middle Ages, they used such carts during crusades. So, the cart gives all units the Aura of Courage ability, and if it is destroyed during battle, all units, regardless of whether they have this skill or not, will gain Fury.
Ultimately, the optimal number of combat units in Heroes is what we have now. It would be great if each faction had its own unique design for combat units. :)