In the last days, I will become stronger through synthesis

When Ye Chen woke up, he suddenly found that there were zombies all around him. Fortunately, he awakened the synthesis system, which can make him stronger.
"Ding, congratulations to the host for successfully binding and gaining cold weapon proficiency."
"Ding, congratulations to the host for successfully synthesizing and obtaining the constitution potion."
"Ding, congratulations to the host for succeeding in drawing ten times in a row, obtaining high-level constitution potion, wind, fire, thunder and lightning abilities."

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