NTR – a multiplayer rebalance of mods for new towns.

Rebalancing, and in the case of NTR, redesigning the mechanics for new Factions, is a very long and painstaking process. You need to play many games, evaluating whether the race loses at any stage, whether the new mechanics are interesting and fresh compared to the existing ones, how it performs against different Factions, and so on. If significant changes are made, you essentially need to repeat the process. You can imagine this yourself. Currently, there are a huge number of mods that add new cities, but very often, in my personal opinion, the new creatures have low detail, they don't fit together (and the feeling of a cohesive Faction is very important in Heroes), the balance was most likely set using an automatic utility or according to the principle of "it will do," the skills were thrown in haphazardly, and the balance was not manually refined (that is, it doesn't exist).