Such a treasure has always been an immense help to He Song.
Because of this, after years of nurturing and feeding it, He Song was very familiar with the Earth Vein Spirit Pearl.
At the same time, he also became thoroughly acquainted with the Earth Vein Qi used to refine the Earth Vein Spirit Pearl.
Under these circumstances, if He Song wished to search for Earth Vein Qi, it wouldn't be too difficult.
Moreover,
the Mysterious Yellow Artifact Refining Technique recorded a powerful array called the Two Elements Qi Separation Array, which could extract Mysterious Yellow Qi.
Although He Song considered this array only slightly stronger than an ordinary Nascent Soul Grand Array,
its effect in extracting Mysterious Yellow Qi was undeniably critical.
Earth Vein Qi is hard to obtain.
In addition to having been extracted by countless cultivators over the years,
it also only appears deep underground, making it nearly undetectable to ordinary cultivators.
