C54 Xuan yuan battle of chi you(2)

After returning to the Human Clan, Chi You started to comprehend the secret method of 'Twelve Immortals and Fiends Formation' that Xing Tian had given him. The result caused him to be extremely shocked, he never thought that the requirements of 'Twelve Immortals and Fiends Formation' was so high that only Ancestral Mages would be able to set up a formation