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Once his bodily strength reached a certain level, he could use even more powerful demonic beast essence blood for cultivation.
From the Qi Refining Early Stage, Qi-refining mid stage, Qi-refining late stage, to even the realm of Qi Refinement Great Perfection, the essence blood of demonic beasts from each stage could be absorbed gradually and in order.
But when his body successfully broke through from the Qi Refining realm to the Foundation Establishment Realm,
he then needed the essence blood of demonic beasts from the Foundation Establishment Stage for body refining.
Of course,
the essence blood of a demonic beast, simply put, is just the blood in the beast's body that contains surging spirit Qi.
Even ordinary blood could be used for cultivation with the Spirit Blood Tempering Skill.
If he could get his hands on a demonic beast's essence blood, cultivating by absorbing the essence blood would naturally yield twice the results with half the effort.
