Well, you take the archive, unpack it, and in the GameMechanics\Creature\Creatures\Necropolis folder, you edit the xdb files. The upgrade is in the 3rd folder.
you need to go here: data.pak/Game Mechanics/Creature/Creatures/the desired Castle/the desired creature type;
and, as psatkha rightly pointed out, you need to know how to work with an archiver (although I personally prefer a different one - WinRAR, which many dislike only because it is paid).
Okay, thanks, I understand.
But I don't understand how to change abilities. For example, I want to give a unit the ability "enemy does not resist". How do I know how to write this correctly and where to write it? I found the "abilities" entry at the very end of the dragon's data, but there is nothing under it, although the dragon does have abilities.
By the way, I use RAR. For some, it's paid, for others, it's free.))
Added 4 minutes ago
By the way, the Lord model has neither a movement animation nor an attack animation. He can only stand, leaning on his sword, or stand with his arms spread out, like a "doll".
Everything can be done, but you need someone who is good at animation and working with "bones".
This is really difficult.
And by the way, does it even make sense - because a three-meter-tall man with a two-meter-long sword will look VERY unnatural!