Well, I'm afraid no one will help you with this; you'll have to figure it out yourself because tinkering with mods is tedious.
Each XDB file is a text file with links and settings. Here are the file structures from Esto100nec1; I've crossed out the files you don't need to look for because normal people don't change them.
I'll also note that effect files are usually in the same folder, so you probably won't have to search for them.
In an XDB file, links to other files are written like this:
- this means that the FIGNYA.xdb file is in the same folder as the file you're looking at.
<>folder_with_stuff/FIGNYA.xdb#xpointer(/FIGNYA)"/> - this means that the FIGNYA.xdb file is located in a new folder, which is located in the same folder as the file you're looking at.
<>/folder_with_stuff/FIGNYA.xdb#xpointer(/FIGNYA)"/> - the slash at the beginning has been added, which means that the FIGNYA.xdb file is located in a new folder, which is located in the mod folder
Esto100nec1 has a lot of good documents on the structure of files; now I'll share them with people who ask me to teach them modding, because modern modders don't understand how things work! I've always known that my knowledge of modding is like a Mechanicus's knowledge of science (not very good), but sometimes I feel like a Magus talking to a Servitor....
A fundamental work, indeed... It's written with such a scientific approach... Just the section on how light works in a file, which describes the structure of effects, is worth something.
Сценарии:
"Холм мертвецов"
"Священное древо"