Air level of the map.

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We also need to add anti-tank guided missiles, Stingers, strategic missile launchers, and put mages in control – let them press the launch button... But most importantly, we need to install a large grinding wheel so that when heroes dull their swords on tank armor, they have somewhere to sharpen them.
The idea might be interesting, but the proposed implementation doesn't fit into any framework.

I forgot to write this.

Great idea, but instead of tanks, it should be ОБЧР (Object of Combined Combat Vehicle). Tanks are not cool, ОБЧР is cool.

We don't need robots; I was literally talking about flying tanks. I meant vehicles with wings, like a helicopter, but with dragonfly wings.

1. We should add an underwater level; then Heroes will become an even more interesting game.

The underwater level was mentioned in a neighboring topic.

2. Rather than a flying castle, it should be a flying ship, built in a special workshop.

I initially wanted to write about a ship. Then, it would probably be better to make the Castle a mobile flying fortress, and the Ship a faster but lightly armored one.