Gliza
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The vampires in the 3rd part are really cool, and the Nagas are just beasts! I've always liked the combination of Djinns and Nagas, haha (death to all!). Overall, in the 3rd part, I just didn't understand the Orcs; they don't seem to be very useful.
The 4th part pleased me with the Necromancers and their cool castle.
And overall, they managed to do everything well, except for the built-in maps. To truly enjoy all the delights of the fourth part of Heroes, you need to download a couple of maps like "Vampirius."
As for the 5th part, I can't say anything definitive yet; I need to spend a couple of weeks playing it.