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When I played Heroes 3, my favorite faction was the Swamp. I especially liked the powerful Gorgons.
On the map, there was a structure guarded by crystal dragons. I attacked this structure with all the factions, with large armies, but I won the battle with the Mighty Gorgons with the least losses, and my army was small.
A drawback is that archers deal little damage, and there is only one type of archer in the army, and it would have been possible to make the 7th-level unit a flying unit.
Perhaps, in Heroes 5, it would be possible to add the Swamp faction, but with changes.