By the way, this is a good thought experiment for gameplay modeling – what gameplay effect will the specified change have?

•Make it so that the portal consumes more movement points, let's say like the base portal, 300 MP;

•If you make it more expensive in terms of mana, it will only add more hassle with mana-hungry creatures, or you'll have to look for +Knowledge or give artifacts, which is also a good idea.

Let's say 300 MP and 40 mana,

I think 40 mana could be a factor if you build the portal early on, or if the hero has little mana, you'll have to get a mana-providing creature, and destroy the hero.

•Also, some spells could be re-evaluated: Counterspell, Fire Shield, Grief, Executioner, reduce their level, move the summoning spells of elementals to the 4th or 3rd level, and there will be no need to restructure – DD will become more accessible, and the portal less accessible;

•or remove the portal altogether, or limit it. After all, it should take time to move an army, and not have an instant transfer and control of the map thanks to the portal. DD is not as critical as the ability to teleport to any city of your choice, regardless of its distance; the portal needs to be nerfed;

Thus, we nerf the portal; we get the inability to quickly move an army, which gives the defending side an advantage; because the tactic of capturing an enemy city, teleporting a hero with a large army there, is absurd, or make the portal only basic, to the nearest city.

For example, 2 players, one gets a portal, the other gets DD, and I think the player with the portal will be able to do much more (it would be interesting to watch this on a stream).

•Re-evaluate diplomacy for creatures of levels 1-2, for example (rework the join calculator, monsters will join if the army is 5 times stronger), this will make it possible to gather small garrisons, which will be a kind of counter to necromancy.

or for all creatures that flee when the join calculator is increased, make creatures of the 1st level 50% join, 2nd level 30%, 4th level 20%, 5th level 15%, 6th level 10%, 7th level 5%; what will change if only 1 angel joins from 20 angels through diplomacy?

•Re-evaluate the Seer skill as completely useless, or remove it altogether