Posts from Several changes. Auto-translated

Regeneration is easy to find; it was added in the add-on. The icons from the add-ons are located in UI/H5A1 (the add-on with gnomes) or UI/H5A2 (the add-on with orcs).

Resurrection is in the textures folder... \Textures\SpellBook______2618\Spells

Added 5 minutes later
If you need a gray frame for the spell, take it from the icon \Textures\SpecialAbilities\Holy_Charge.(Texture).dds; it's easy to remove the image in the center.

I "drew" the icon. It just turned blue for some reason

The save settings are incorrect. If you're using Paint.net, you can choose the compression type. For icons, you need A8R8G8B8; there's also a similar type that starts with X instead of A – don't choose that one.

The save settings are incorrect. If you're using Paint.NET, you can choose the compression type. For icons, you need A8R8G8B8; there's also a similar type that starts with X instead of A – don't choose that one.

The save settings are incorrect. If you're using Paint.net, you can choose the compression type. For icons, you need A8R8G8B8; there's also a similar type that starts with X instead of A – do NOT choose that one.

Seems like I've sorted out all the technical issues. 
Two last questions remain:
1) Is there any way to change the whip strike spells? 
2) Is there any way to make acid breath apply the poisoning effect to 2 creatures at once? 

alas and alas - nothing like that can be done

spells definitely only change for the daughters of the earth ability (spell strike), while the whip strike doesn't seem to change

usually the settings are written in the file \GameMechanics\RPGStats\DefaultStats.xdb (take it from a2p1-data.pak, not from data.pak) look for the line <Creatures>, after it come the abilities divided by factions

I see, that's a shame. Can I change the stats of buildings somehow? For example, to make the Treasury generate more Djinns.

....seems like it, and it's done in the same file.

no, it's in \GameMechanics\RPGStats\DefaultStats.xdb

separate files for objects and spells are just useless templates; nothing changes except the price, icons, and names

Added 2 minutes ago
I checked, there is no such parameter there (the increase only changes for the goblin trash mob)

Added 12 minutes ago
damn, only dwarves and orcs have an additional increase that changes....

So, everything is ready. Can you test it?
https://disk.yandex.ru/d/WXUEoW0twDSv3w
To install, you need to place Yoba_mod.pak in the Heroes5\data folder
And H5_Universe.exe in the Heroes5\bin folder

Run it using H5_Universe.exe

No, there's too much going on there, I don't know what specifically should work and how it should work, you test it yourself.

I don't need to test all the features, just the fact that it runs through an executable file. Okay, I'll ask some friends.