Adding unique items to shops and custom backgrounds

Hello ladies and gentlemen,

I wish to mod a custom background and also some shops with unique items, mainly the Sword of Bangelian Scourge, Bow of Ecclesiates and Finger of Mannox, however, I am unable to do so.

I have modified my "invensource.mes" with items found in "description.mes" but on adding unique items from "gamedesc.mes" the items do not show up in new-game selection-screen save for the occasional empty placeholder as well as a completely empty selling inventory of any shop I edit. The latter, therefore, also omits the other items normally in stock.

To note that these unique items are also mentioned in "onames.mes" having different values.



Another notable thing is that gamedesc.mes is only found in the "Module template/mes" direcotry after undat-ing "Arcanum 3.dat". Furthermore, the file was devoid of information except for two lines, thus, I created a new "gamedesc.mes" in "C:\Arcanum\data\mes" and copy/pasted the data from here: https://arcanum.fandom.com/wiki/Gamedesc.mes (below screenshot refers)



As per the following link, my idea seems to be impossible to achieve, however, given that over a decade has passed from the thread, maybe a method has been found...
https://terra-arcanum.com/forums/index.php?threads/add-items-to-invensource-mes-not-in-description-mes.9351/

I would appreciate any help or pointers on this matter as I am at a loss on how to go about achieving this.

If any other screenshots or data are required, I'll be happy to oblige.

Thank you very much.

Other links:
https://terra-arcanum.com/forums/index.php?threads/editing-shopmap.14492/
https://terra-arcanum.com/forums/index.php?threads/unique-items.9425/

*edit: mistakenly wrote "gamedesc.dat" instead of "gamedesc.mes"
*edit: clarification that background to be modded is not an already implemented one but a custom one

 

Further information on my setup is the addition of UAPv1.5.1 and XP-Patch from MeousPad as well as Orc Bandit and Malochean Hand extra dialogs and fight scripts. Also, a custom "invensource.mes" as modified from UAP's "Arcanum 5.dat".

Undat-ing "Arcanum 5.dat" does not yield any "gamedesc.mes".

The intention for this thread is because I wish to start the game with the strongest weapons (in my opinion) having played same for too long to play vanilla, the game as intended.

Thank you once again.