The secret realm's only Quasi Fourth Rank spirit vein lay within Two-Headed Valley. Moreover, after tens of thousands of years of accumulation by the Azure Scale Snake Clan, the strongest clan within the secret realm, this valley had been forged by them into an impregnable fortress.
Within it, the clan had arranged a Quasi Fourth Rank Array Formation equipped with both an offensive array artifact and a defensive array artifact.
With the support of two array artifacts at the Spirit Treasure Prototype level, the formation's power was at least nearly twice that of an ordinary Quasi Fourth Rank Array Formation, possessing roughly fifty to sixty percent of the might of an ordinary Fourth Rank Array Formation.
Under such circumstances, protected by that formidable Quasi Fourth Rank Array Formation, even when the White Shadow Lake Flood Dragon Clan, the Flame Demon Wolf Clan of White Flame Volcano, the four Golden Core Demon Race clans subordinate to the two top clans, and Ling Pengyun's party of more than a dozen cultivators all poured forth in full force—gathering over eighty Golden Core combatants and more than a hundred thousand low-rank demon beasts—they still could not breach Two-Headed Valley in a short time.
Fortunately, they had the variable that was Bei Shan Zhenren, a Spirit Vein Master!
Relying on the formidable Vein-Seeking Escape Technique, which only a Third Rank Spirit Vein Master could comprehend, he repeatedly brought Ling Pengyun and the Dragon Abyss Flood Dragon King into Two-Headed Valley, where they secretly assassinated more than twenty Golden Core Demon Kings from the Azure Scale Snake Clan stationed there, as well as Golden Core Demon Kings from several of its subordinate factions.
The demon beasts within Two-Headed Valley had virtually no way to counter this escape technique. Even the veteran Golden Core Completion demon beast