That was why he had dared to try it, leaping into the Vajra Sect's Body Tempering Pool and spending seven days completely exhausting its energy.
Now, in this pool, the incomparably potent Bone-Eroding Demon Crystal met the extremely resilient Vajra Mother Ore. It was like fire to dry tinder, sparking a violent reaction and causing the energy within to churn.
The Demon Crystal's corrosive power furiously stimulated the mother ore, managing to forcibly extract a large amount of Vajra Essence Qi in just nine days—a process that would have normally taken years.
This was what gave the pool its color: a black so deep it was terrifying, yet it also contained a tremendous power for Body Tempering.
Unfortunately, even with this, the pool's efficacy was still a far cry from that of the Vajra Sect's Body Tempering Pool.
After all, the Vajra Mother Ore in that pool had been releasing its energy day and night for countless years, building up a profound reserve.
