Damn, but still, how do you make such things happen:

As far as I remember, this screenshot is from the Heroes 4: Equilibrium forum, or whatever the correct spelling is. Besides, there are many different and interesting screenshots there. All of this is the work of the creators of this wonderful mod for Heroes 4. But if you know some tricks of the editor and its, let's say, loopholes, you can teach a hero many spells, for example, how to "enchant" - magic of order, 2nd level - it acts like the mermaid's skill, hypnotizing the enemy for one turn, plus completely ignoring magic resistance. There is also the possibility of teaching a hero spells like various nectars and liquids, for example, "potion of the mage" - for some reason, it belongs to the magic of chaos, 1st circle, "haste" - the effect of the haste potion (plus one attack in melee and ranged combat for three full turns), and so on. The main thing is to find these loopholes.

To confirm everything said above, you can find my maps on the forum; their descriptions contain a lot of information