Toganash
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Why should it be that way? Dirt is the land of Necropolis.
In the spirit of the game, each starting castle should be on its native land, or it shouldn't generate in places where it shouldn't. But if we follow your logic, why did they fix this in Inferno's dungeon – after all, it's also underground – when it should be the domain of Dungeon, even though there's lava there. And, based on the balance rule, it turns out that at the start, the Dungeon's troops, when generated from above, won't have the proper bonus, unlike other castles.