Item description:

Xenoblade Chronicles 2 Save Editor
This is a full items editor
I dont take credit for this as I just touched up a little of the code to allow more editing

Screenshot

Match your current items with this website

Code:
You will need the item id to add or edit item in each tab
ie: Premuim Cylinders from site is 2004, only use 4
View attachment 131314
Download
This was forked from this project

Enjoy!

Old Editor
Added ability to set item id and serial to first 5 weapon chips of save
Set 0-4 with values bellow to add these items

Code:
ID Serial
Tachyon 60 149
Moon Matter 58 146
Preon 59 292
Sunlight 54 144
ShiningStr 52 147
Code:
Max Values = 9999999 / 65535 / 5
Make sure you backup your save first
if you have issues please report on github
Thanks to @williamdabastrd
he is working on a multi-platform editor

There is a bug, it is not padding the values with 0's correctly
Download here - New Version Available

Saves from new DLC are a issue, this is due to new file size.