Whenever the Spiritual Energy Tide came to Hidden Dragon River, the spiritual energy concentration reached its peak at noon and remained there until midnight.
After that, the spiritual energy concentration slowly declined, completely returning to normal at the beginning of the Mao hour the next day.
For roughly half a day, it could remain at its highest level.
Last time, True Man Lei Yan had barely absorbed any external spiritual energy, yet he had still formed his Nascent Soul in an extremely short time. What he had relied on most was the spiritual power within the Corpse Core.
That had been left behind by a Nascent Soul peak cultivator. Even though much of its spiritual power had dissipated, what remained still far exceeded all the spiritual power possessed by a Nascent Soul Early Stage cultivator.
If a Half-step Nascent Soul cultivator lacked the aid of a fifth-order spiritual item and wished to break through using fifth-order spiritual energy—
Even if all the spiritual energy at the mouth of Hidden Dragon River were given to him, he would still need six or seven days to accumulate enough spiritual energy for a breakthrough.
Although it did not require half a year of preparation like a cultivator forming a Core Formation, forming a Nascent Soul still required a stable supply of fifth-order spiritual energy.
To form a Nascent Soul with only a few hours of fifth-order spiritual energy, the concentration would have to reach upper-grade fifth-order at the very least.
And the person forming the Nascent Soul would also need sufficient ability to absorb that spiritual energy.
Though it was not enough for forming a Nascent Soul, its effect on improving cultivation was still excellent.
After Wang Daoyuan used the internal refinement method for half an hour, the carrying capacity of his five