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Cultivating the Blood Demon Body Refinement to break through to the Purple Mansion would certainly involve facing a Heart Demon a hundred times more powerful.
This was also a drawback of Demonic Cultivation Techniques, where ordinary cultivators would naturally progress faster, but when it came to breaking through, the Heart Demons they encountered were fiercer than the last.
Ordinary Demon Cultivators would seek out treasures to offset this, or their Sects might possess special secret treasures for this purpose.
However, a genius Demon Cultivator's Dao heart was inherently a demonic heart.
He would not feel remorse for killing, nor find his actions bloody, and thus naturally would not have a Heart Demon.
A Heart Demon is a doubt about one's own cultivation, thoughts, vision and actions!