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Found a mega-image on the internet. Someone put a lot of effort into creating a diagram showing the migration of creatures between cities across all parts of Heroes. Be careful – the file is 3 MB and quite large – http://vk.com/doc171687048_204915093?hash=51a5d2e0aff6d867be&dl=484bcad1b4d411088e
I noticed some interesting things for myself, although they were already there, but the diagram allowed me to pay attention to them. For example, some units that are bright and somewhat iconic for a castle are sometimes relocated from it or disappear altogether. For example, Death Knights were only in Necropolis in the third part, becoming neutral in the 4th and 5th, and disappearing in the 6th, and yet it's hard to imagine the undead without them. The monsters of the Barbarians were in the Fortress both times, but after the 4th game, they didn't appear again, just like the Ifrits, which moved from Inferno to Chaos. But the Goblins, being cannon fodder for the Fortress in all parts, were relocated to neutral lands in the 4th game and became quite powerful.
However, I disagree with the lack of connection between the Orcish Shamans from the 5th part and the Shamans from the 6th.
I noticed some interesting things for myself, although they were already there, but the diagram allowed me to pay attention to them. For example, some units that are bright and somewhat iconic for a castle are sometimes relocated from it or disappear altogether. For example, Death Knights were only in Necropolis in the third part, becoming neutral in the 4th and 5th, and disappearing in the 6th, and yet it's hard to imagine the undead without them. The monsters of the Barbarians were in the Fortress both times, but after the 4th game, they didn't appear again, just like the Ifrits, which moved from Inferno to Chaos. But the Goblins, being cannon fodder for the Fortress in all parts, were relocated to neutral lands in the 4th game and became quite powerful.
However, I disagree with the lack of connection between the Orcish Shamans from the 5th part and the Shamans from the 6th.

