Items that are able to be enhanced: Treasure Combo. The attributes of items that have been enhanced will rise by 10%. If you fail to enhance an item without a protection charm, you will be demoted 1 level in rank.
Your current enhancement level will determine your maximum enhancement times (ex: your current level is 10, so your 10th enhancement will be successful).
Each type of enhancement stone has a different enhancement rate, described in the following table: