Song Wen drew the soybean-sized crystal into his hand and gently rubbed it.
Though it was only a fragment of an immortal stone, it was enough to prove that his method could find immortal stones and Immortal Spirit Marrow.
After cracking open all the excavated stones, Song Wen obtained three more immortal stones.
He took out an Earth-Escape Talisman and burrowed underground once more.
Thus, time slowly passed between searching for stones and cutting them open.
In the blink of an eye, three days had passed.
Song Wen had acquired three hundred immortal stone fragments, which he estimated to be worth the equivalent of ten to twenty complete immortal stones.
However, Song Wen had not seen even a drop of Immortal Spirit Marrow.
That day, he tunneled underground as usual, gathering stones with abnormal spiritual energy fluctuations. But just a few miles below the surface, he discovered a bowl-sized hollow amid the soil and rock, which should have been tightly packed and solid.
Song Wen was no stranger to such hollows. On the contrary, he was exceedingly familiar with them.
Whenever he took away a stone, he left behind a hollow like this.
Song Wen's brows furrowed slightly, but he did not dwell on it and merely continued searching.
Yet, about the time it took to drink a cup of tea later, two hundred miles underground, Song Wen saw another identical hollow.
"This..." Song Wen could not help but feel puzzled. Could someone possess a method similar to mine and have already searched this area?
The moment this thought arose, Song Wen rejected it.
That was because he had found only these two hollows. Moreover, near both hollows, he had gathered quite a few stones with abnormal spiritual energy fluctuations.
"Unless..."
Another possibility suddenly occurred to Song Wen.
In the