On the previous page, the message numbers are 1805 and 1811!
The names of new creatures are not stored in the .exe file; they are all in separate .txt files, and the .xdb file contains links to them!
If you decide to create new creatures, you can experiment with the creatures from my page (link in my signature)! :smile13:
Added 1 minute ago
Creature names are defined in .txt files, and links to them are in .xdb - in game.exe [you can make changes with any hexadecimal editor, i.e., without decompilation] - the maximum possible number of creature identifiers, which are described in the corresponding .xdb, has simply been increased.
Added 5 hours 9 minutes ago
you need to look at it and analyze it yourself
based on my experience with Disciples 3, I can say that there may be several extra lines with unclear 4-digit numbers at the beginning
I opened it with Visual Studio 2017