Since breaking through to the Void Insight Realm, Lin Fei had yet to attempt refining higher-grade immortal-grade spirit pills.
The main reason was that he lacked suitable medicinal ingredients.
Lin Fei knew almost none of the many immortal-grade spirit herbs and medicinal plants he had gathered from the Immortal Blossom Garden on the Immortal Island, so he had never tried using them to refine pills.
Even the Holy Demon Sect's Cosmos Mirror contained no records of these immortal-grade spirit herbs and medicinal plants.
He suspected that these wondrous immortal blossoms were simply too high-grade for even the Holy Demon Sect to have recorded them.
After all, the Immortal Island had been left behind by an Ancient Immortal. Presumably, one would have to reach an Ancient Immortal's realm before those wondrous blossoms could be put to use.
An Ancient Immortal would not spare heaven-grade spirit herbs and medicinal plants a glance, so they grew like weeds on the Immortal Island, found only around its outskirts.
Most of the immortal-grade spirit herbs and medicinal plants on this Medicine Mountain in the Gu World, however, had been documented.
The great void immortal-congealing herb, for instance, was merely a low-tier immortal-grade spirit herb.
Yet it was one of the main ingredients for refining the Void-Breaking Pill.
Relevant records had been passed down in the medicinal compendiums and pill formulas of many immortal-path factions.
"I gathered a hundred and thirty-three great void immortal-congealing herbs in total. If I can cultivate them all to maturity, I should be able to refine at least a hundred and thirty-three Void-Breaking Pills."
Every Void-Breaking Pill represented a Void Insight Realm cultivator.
Just imagining more than a hundred Void Insight Realm cultivators serving under him someday filled Lin Fei with visions of boundless glory.
"If I can successfully transplant and