Xivken

Yes, i've tried replacing them with id of another item and that changes the item sold to the new item

To exploit light and shadow, you can simply go to cat shrine and exchange your starchart for light/shadow there, make sure to use nopaew exploit first so that you have tons of starchart to exchange. However you can only exchange the light/shadow of starchart sold in nopaew (Light katana and lance, shadow katana and hammer). I have been able to find id of item in nopaew shop, but I can't seem to find the real value of these id, anyone can help? (The one checked are the encrypted value of item id)