Dark Blood Demon was stunned by that incident, and only later on did he discover that the energy was soul power. After devouring his grandfather's soul, he had attained one rank of soul power.

At the time, his first reaction was that this was a present left to him by his grandfather, and he was ecstatic to finally have soul power. He went to an elementary Soul Master academy and was accepted as he now possessed soul power, but he quickly discovered that all Soul Master cultivation methods, including the likes of meditation, were unsuitable for him. Thus, even after cultivating for half a year, his pitiful single rank of soul power didn't increase in the slightest, and as a result, he was expelled.

At the time, Dark Blood Demon suddenly recalled how he had obtained this one rank of soul power. Could it be that...