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Personally, I have a huge attachment or even a passion for Heroes 3, which is why I would like to see everything—the swamp, the Barbarians, and... reading your posts here, why does nobody want an elemental castle?? It appeared last in Heroes 3 and caused very contradictory reactions—some love it, others even ban it in championships, but I think everyone wouldn't mind playing with it. Of course, it's unlikely that Nival will now take the familiar fairies from Sylvan, rip out the elementals and phoenixes available in Magic (the latter being as high as tier 5), and combine them into a separate town, but still, the concept of an elemental castle fits very harmoniously into a fantasy world. And I really liked the psychic elementals! Bring back the psychics! :)))
Plus, I can only imagine how it would look from the inside, rotating as the camera flies around... my mouth is watering; it would probably be the most beautiful castle in Heroes 5. :)