serovoy
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The file "Avatars of Death" is located in the same folder as the "DefaultStats" file (you must have worked with it); open it – the "Avatars" file – and do whatever your heart desires.
It's more complicated with heroes. Theoretically, you can give a hero the model of a creature with all its animations by replacing just one line. The only doubt is about movement on the map, if you remember the extremely stiff walk of the Mistresses. So, find another creature...