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A 1% chance of creating a counterfeit that's three grades higher than the item;
a 0.1% chance of creating a counterfeit that's four grades higher than the item;
and a 0.01% chance of creating top-grade counterfeit!
The appearance and attributes of the counterfeit are identical to the real deal, but once used, it can only maintain the genuine attributes for 10 seconds, and each piece of counterfeit randomly generates one defective attribute, such as self-destruction, self-harm, devouring master, abdominal pain, etc...
The closer the quality of the counterfeit to the real item, the harder it is to spot flaws and the more stable it is; equipment of the same grade can always maintain the genuine attributes.
Ordinary identification skill cannot differentiate between real and fake; only identification skills of a higher level than counterfeiting level can discern the truth.
From today onward, you can only sell counterfeit goods!