The booklet in Ye Xuan's hand was not a martial arts cultivation method at all, but a low-level cultivation Qi refinement method derived from the path of becoming an immortal. It even contained techniques to devour blood essence, clearly something that had been passed down by the terrifying Blood Souls.
Ye Xuan vividly remembered that over a million Blood Souls escaped from the Blood Sea Battlefield, among which were many formidable beings. They were once exalted immortals, and although they perished in the Ancient Battles and their remnant souls were suppressed under the Blood Sea, they were not to be underestimated.
Ye Xuan deeply understood one thing, these remnants of the immortals' souls were nothing like ordinary Blood Souls.
Their spiritual wisdom was extremely high, and they could vaguely remember their past lives. Hiding among humans, they constantly devoured the essence of Blood Souls, and their cultivation advanced at an incredible pace.