DmitriyAS
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:) Well, I didn't know that. Do you mean that heroes of the same class are just heroes from the same type of castle? Well, that makes sense. I was looking at a Swamp creature in the right window, and there was also a Swamp creature in the left window, and I only realized that by looking at the types of troops in his inventory. :)
I meant two classes that are specific to heroes of the same "faction." For the Swamp creatures you mentioned, these are the Beast Master and the Sorceress.