Given the conditions of the Ancient Ruins Space, Zhou Tian thought it wouldn't be surprising if the Big Tree had yielded something related to Yin energy. After all, it was inconceivable to believe that a living being or an object could remain unaffected in such an environment. After death, it is only logical for a creature to leave behind an energy crystal filled with the Yin energy it had collected.
But now, Zhou Tian thought the Big Tree, which he believed to be of Yin nature, left behind a Yang artifact after its death. How could he not find such an occurrence strange?
From Yin Comes Yang. Zhou Tian can only use this saying to explain his present situation.
Hence, after confirming the source of the Yang energy, what Zhou Tian considers next is obviously how to handle the Yang energy in his possession.
But there is probably no need for him to mull over it anymore.
