Fang Hong sat in the stone house, holding the Four Symbols Formation deployment method in his hand, his eyes fixed on the records about demon blood.
The text clearly stated that the Rank of the demon blood was directly related to the power of the Four Symbols Formation deployed.
The higher the Rank of the demon blood, the stronger the power of the Four Symbols Formation deployed.
Fang Hong was deeply shocked when he saw this.
Recalling the Four Symbols Formation Xiao Yue had unleashed when she fought him earlier, he had personally experienced its power.
Without the help of the Advanced Lightning Thorn Talisman, it would have been quite difficult to break that formation.
The most crucial point was that Xiao Yue had only used Rank Three demon blood, and the Four Symbols Formation she deployed possessed such powerful strength, even able to contend with a Foundation Establishment Stage Late-Phase Cultivator.
