Earth Immortal Realm.
Sky Brahman City.
Silver Light flashed, and the heterodox incarnation appeared, his face showing a trace of joy, "With my main body advancing to the mid-stage of Returning to Emptiness, I can also begin cultivation..."
After some thought, he felt a bit of regret, "It's just that the cultivation for Returning to Emptiness is too slow, and too tedious... When I head to the tri-clan battlefield this time, why not capture a few Cultivators who cultivate the 'Self-Transforming Heavenly Sovereign's True Demon Art of Controlling All Spirits' from the Transcendent God Demon Clan... These are truly nourishing tonics, far better than any Spiritual Pills."
Of course, if possible, capturing a Transcendent God from the Demon Clan who cultivates 'Self-transforming Demon Skills' would be an even more direct method. Advancing to the mid-stage of Returning to Emptiness would not be a problem at all.