The Five Elements Unity Pill required five immortal-grade spirit herbs or medicinal plants, each containing one of the five attributes: metal, wood, water, fire, and earth.
Furthermore, the quality of these five immortal-grade ingredients could not differ too greatly, lest an ingredient's medicinal potency prove too strong or too weak during refinement and cause the process to fail.
The three immortal-grade ingredients Lin Fei could gather had all been collected in the Gu World.
Ten-thousand-year purple gold ginseng possessed the metal attribute.
Longevity green vine possessed the wood attribute.
Nine-turn mysterious yellow grass possessed the earth attribute.
Moreover, these three immortal-grade spirit herbs were of similar quality and could meet the requirements for pill refinement.
The two missing immortal-grade spirit herbs needed to possess the water and fire attributes.
Immortal-grade spirit herbs and medicinal plants were extremely precious to any immortal cultivation faction. They would not readily display them to others, let alone sell them.
The only ones Lin Fei could think of were the Dragon Family and the Phoenix Family.
These two ancient lineages had long histories and deep reserves. Perhaps they could produce immortal-grade ingredients of this caliber.
They also happened to be his allies. As long as he offered enough in exchange, they would surely agree to a trade.
Through the Spirit Bodies Long Aotian and Golden Treasure had left with the Dragon Family and the Phoenix Family respectively, Lin Fei contacted the two families' Earth Immortal ancestors.
To sway these two ancestors, he offered an Eternal Evergreen Pill in exchange.
The Phoenix Family's Earth Immortal ancestor soon replied.
Golden Treasure immediately relayed the news to Lin Fei.
"Daddy, the Phoenix Family's Earth Immortal ancestor said their lineage does have some fire-attribute immortal-grade spirit herbs, and she's willing to trade with you."
"But she wants you to