The interior is filled with dense Yin Qi.
But it doesn't have the variety of characteristics that other spirit mines have.
At best, it can only extract the Yin Qi within for other uses.
Once the Yin Qi is fully extracted, these stones simply become stones.
Perhaps, after many years, these stones could still be infused with dense Yin Qi, returning to their former state.
However, such a process would take far too long.
Therefore, He Song merely has his puppets collect them and continues on his journey.
Besides these stones similar to spirit stones.
Some of He Song's puppets have also discovered spirit plants and spirit fruits filled with dense Yin Qi.
These spirit plants and spirit fruits do not contain spirit Qi inside.
But rather Yin Qi.
However, since the effects of these spirit plants and fruits are unknown, He Song certainly won't use them recklessly.
These items are specialties of the Yin Soul Realm.
They might be of great use to Yin Souls or ghost cultivators.
