Grading Of Weapon

Junk Grade 10-50%
Normal Grade 100-149%
High Grade 150%-199%
Master Grade 200%-249%
Perfect Grade 250%-300%

Tips: To calculate the percent(%) of the weapon/armor. If you make a dragon shotgun attack 142-179 and the basic attack of dragon shotgun is 102-128. Use the minimum or maximum of the attack to divide. For example, (179/128)*100 = 139.8% normal grade.
High Grade weapon/armor only last for 7 days. Use extension stone to extend the weapon/armor to add 10 more days. Others the High Grade weapon/armor cannot expired except the item with warranty period.