That was right—the inherited fire seed in Ye Zhen's dantian was Heaven Grade!
Under normal circumstances, this inherited fire seed could only have risen to Human Grade. But ten thousand years was simply too long—so long as to be unimaginable!
For nearly ten thousand years, it had been supplied with energy by twenty subterranean Spirit Veins. The twenty High-grade Spirit Veins had fallen from high-grade to mid-grade, then to low-grade, then to having no grade at all, ultimately becoming this weak!
Fortunately, when those twenty High-grade Spirit Veins had weakened to the brink of dissipation, thousands of years of subtle influence had finally allowed them to take root in this land, and they continued supplying energy for several thousand more years.
A quantitative change brought about a qualitative change. In the end, the inherited seed broke through to Heaven Grade. The surging energy within it developed Ye Zhen's newly opened fifth Talent Bloodline to a terrifying length of ten feet in one stroke!
Most crucially, the Profound Fire Spirit Meridian Ye Zhen had just forged became a Heavenly Fire Spirit Meridian the moment it was formed. It brimmed with unimaginably pure fire-element spirit energy and possessed an incomparably powerful Heavenly Fire seed.
So long as Ye Zhen wished it, he could unleash earth-core Heavenly Fire of astonishing power anytime, anywhere!
And the might of earth-core Heavenly Fire was exceedingly formidable.
Below Human Fire, ordinary martial artists at the second or third level of the Soul Sea Realm would all be reduced to ashes!
Above Human Fire was Earth Fire, whose power was several times greater still. From peak fifth-level Soul Sea Realm martial artists to peak seventh, eighth, or ninth-level Pulse Forging Realm martial artists, none could withstand Earth Fire!
As for Heavenly Fire, its power was even more terrifying!