C31 System I Eat Lemons

A few minutes later, Ye Fenng reached the end of the passageway. The cavern opened up into a vast space, where a crystal emitting a deep blue glow was firmly set into the wall. Intricate patterns adorned its surface, reminiscent of ancient tribal totems, radiating an intense blue fluorescence. This was the object of Ye Fenng's quest.

According to the original story