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Generally, I am almost completely satisfied with the number of factions that currently exist in "Heroes 5." But if someone wants to create new factions (or submit ideas to Nival so that they can create them), I have the following idea:
In the lore of the Might and Magic series, it is written that in the Seven Cities, wizards were heavily involved in genetics, trying to create servants to replace orcs, and they created various half-human, half-beast creatures.
In principle, this could be used to create a new faction – the Beastfolk. The lore could state that the Beastfolk fled from the wizards: centaurs went to the orcs, minotaurs went off on their own and were later enslaved by the dark elves, and the remaining peoples, who were not numerous enough to survive on their own, were forced to unite and flee to a remote steppe, where they lived in seclusion. This steppe was so remote, and their seclusion so deep, that, in fact, no one knew of the existence of the Beastfolk.
Until they grew stronger, got back on their feet, and emerged from their remote steppe... let's say, to take revenge on the wizards.
This faction could include units from the Swamp and Dungeon factions of "Heroes 3" that were not included in "Heroes 5" – gnolls, lizardmen, harpies, medusas... but preferably not all of them; we also need to create new creatures.
Alignment – more or less neutral, except they hate wizards.
Magic – I'm not sure about this. Either they should be given the same treatment as the orcs – that is, deprive them of magic, give it to individual units, and come up with some ability that partially replaces magic, or they should be given a new Dragon and, accordingly, magic.