Lu Yu walked out of the Tower of Heaven, having just experimented with the Holy Power inside. It turned out that using the Demon-Breaking Saber was more energy-efficient.
To slay a demon, using Holy Power consumes far more Spiritual Power compared to the Demon-Breaking Saber. However, in the absence of the saber, Holy Power is still a decent force, at least sufficient for emergencies.
The Holy Light Seed given by the God of Light is a bit small, with its maximum conversion rate capped at the sixth level of the Qi Cultivation stage, roughly converting 6000 units of Spiritual Power into Holy Power each time.
The Holy Light Seed can only accommodate 6000 points of Holy Power; any more would overflow and affect Lu Yu himself. To convert more Holy Power, he has to use up the current Holy Power before infusing more Spiritual Power for conversion.
The conversion has a slight loss, consuming roughly 6100 points of Spiritual Power to convert into 6000 points of Holy Power.
