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For Wang Tao, the greatest benefit of this potion was that it allowed him to synthesize Crystal Cores that contained impurities!
Some Crystal Cores were too rare, potentially impossible to find a second one of, or simply unattainable at the moment. In such cases, to fuse the Crystal Cores, one would have to endure the internal impurities.
For instance, when Wang Tao previously fused a Level 4 Ascension Crystal Core, it was already difficult for him to obtain 4 Ascension Crystal Cores, let alone gather 12 to ascend. Therefore, he had to tolerate the internal impurities and use a Cleansing Potion afterwards.
Now, having acquired 20 Cleansing Potions all at once, which equated to being able to clear 20% of the internal impurities, this should last Wang Tao for quite a while!
As for the "Purification Agent (Experimental)" and "Deactivating Potion (Experimental)," both were also great finds.