Bone essence was extracted from the essence of the bones of bone beasts. It contained a large amount of vitality and energy, making it extremely precious.
Generally speaking, even if it was a King stage bone beast, after extracting all the essence from its skeleton, one could only extract one or two catties of it. Each catty was equivalent to one hundred upper spiritual stones, which was very precious.
The bone essence that the skinny old man had given Li Tian was exactly eight catties, which could be exchanged for eight hundred spiritual stones, which was much more than all the spiritual stones that Li Tian had.
He sat cross-legged in the cultivation room and circulated the Emperor Sutra to absorb the boundless vitality in the bone essence.
This life force was very strange. After being refined, the unique and mysterious power of the dead spirit creatures would be released, which had a strong effect on refining the body and veins.