The Immortal Spirit Holy Spring hadn't upgraded for a long time.
It wasn't that Ye Feng didn't want to promote it, but rather he lacked the necessary materials.
Until he entered Xia Yao's mansion and saw that Divine Spring, through the Eye of Insight, he learned that this item could facilitate the upgrade of the Immortal Spirit Holy Spring, sparking an idea.
So, he spent a huge fortune to buy the Divine Spring, specifically for upgrading the Immortal Spirit Holy Spring.
However, simply having this Divine Spring wasn't enough for the Immortal Spirit Holy Spring to successfully transform into the stronger Moon Reflection Divine Spring; the water from the Eternal Ancient Divine Pool was necessary.
So, Ye Feng purchased the pool water.
Plus, the Heavenly Dao Array Patterns he realized from the three supreme treasures: the Wordless Heavenly Scripture, Destiny Divine Stele, and the Eternal Ancient Divine Pool, could promote the transformation of the Immortal Spirit Holy Spring.
