C57 Shopping like Crazy Cheating You

Weapon Upgrade Stone: Can increase the quality of weapons. It can only increase the quality of weapons by a small level. It cannot be increased by a higher level. For example, Gu Yi's Thunderstorm Spear can only be upgraded to the Silver Peak with the upgrade stone. It cannot break the silver restriction.

Nirvana Heavenly Thunder: Collect Power of Thunder and refine it with precious materials