This was the Spirit Artifact Zhao Qian had given Li Yu back in the Thunderclap Domain in exchange for Ying Ruomu's Pure Heart Lotus. It was called the Yellow Sand Sword.
Li Yu had refined it with his spiritual sense, but its earth attribute did not mesh well with his Yi Light Condensing Edge. Besides, he had found no opportunity to use it lately, so he had simply left it sitting around.
"Among the five elements, earth serves as the foundation. Earth-aspected spiritual objects can serve as the core of the vast majority of formations."
Su Wen taught him another point of theory, then analyzed the Yellow Sand Sword's specific attributes. Using computing power, he conjured an identical sword in the laboratory and gave Li Yu a demonstration.
Of course, the Star Coins spent on that computing power were deducted from Li Yu's account.
It was not expensive-just 0.39 Star Coins.
But when Li Yu thought about how he was only in adult elementary school, with adult middle school, high school, junior college, and university still ahead of him, he became even more eager to earn more Star Coins.
After class, Li Yu's spiritual sense returned to his body. He took out the Yellow Sand Sword, infused it with True Essence, and planted it beside his meditation cushion.
Next, he took out the Ink Brush and began writing and drawing on the floor. He was sketching the formation, making a rough draft in advance.
Since he had only just learned it, the details were still vivid in Li Yu's mind. Before long, he had finished sketching the formation patterns for the Essence-Gathering Spirit-Storage Formation.
Next, he took out eight Spirit Stones and arranged them in a circle around the Yellow Sand Sword, equally spaced in the eight trigrams' directions.
Once