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This function is only available for transforming into Necropolis. Otherwise, I'm afraid you'll have to resort to some rather unconventional methods.
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you can use it as a model for a ruined city, for example, a log or a stone. But it won't be possible to position a hero on the former outline of the city (a circle with a radius of 6).
If the methods mentioned above don't work, then I don't know any more.