why i using Blood Sleeping Dragon but "not the proper material for refining" appare ?
There's an issue with refining which results in the "Improper Material" message, even with correct materials. It's reportedly due to issues with the game files, so re-logging or re-installing may correct it temporarily. But we're collecting incidents and reporting them in order to get a permanent solution.
If you've lost valuable items like Tender Stones to bugged crafting attempts, please send a support ticket. We'll document the case for the devs, and we may be able to refund the lost items in some cases.
Had this before and seems to be an issue with game files.
This fixed it for me:
On my PC made a new folder and moved all file from 9d folder to the new one (cut&paste). Started game from new folder and it worked after.
It seems it doesn't work for everybody.
Moved the game multiple times within different directories and/or installed a few copies ... still can't use the weapon refinement.