In the Zu Mountain World, two people were chiefly known for having refined the Black Tortoise Black-Sha Rahu Blood Flame Divine Aura: Old Man Cangxu and Venerable Five Obscenities, a disciple of Dharma King Xuanyuan.
Venerable Five Obscenities had refined the orthodox basic version, also called the Golden Crow Divine Barrier. Its power was still top-tier.
Years ago, when the Dragon-Slaying Abbess had reincarnated as Shen Xiu and wandered the mortal world undergoing tribulations, she had clashed with Venerable Five Obscenities. Nun Xinru had destroyed his barrier and stripped away much of his cultivation. He had refined it anew afterward, but never restored it to its peak. In the end, Venerable Five Obscenities had died at Shi Feiyang's hands, and even his primordial spirit had been taken into the All-Heavens Mystic-Demon Divine Lamp.
Old Man Cangxu's version was the ultimate form, nurtured and refined for a thousand years. Even a single wisp clinging to someone would severely injure and poison them. If it drifted into the mortal world, it could unleash a great plague wherever it landed and bring countless disasters.
Because this treasure was so poisonous, Old Man Cangxu had only used it as a last resort to protect himself through heavenly and mortal tribulations back when he had been one of the Six Oddities of the Cosmos. Once he had perfected his Dao arts, he had sealed it away and stopped using it.
Later, when the twelve Demon Kings of the Western Religion had attacked his home, Old Man Cangxu had hastily unleashed it, only for the six great cult masters to join forces and seize it. He had suffered a crushing defeat.
The version Dharma King Xuanyuan had refined originally differed only slightly in method from Old Man Cangxu's, with much the same ultimate power.
He had