"What promise?" Lu Xiaotian asked.
The Primordial Sword Demon said, "In the future, when you reach the Immortal Realm, if one day my secret is discovered by someone else and can no longer be concealed, or if I reach a dead end with nowhere left to go, there will be no need to imprison my Primordial Spirit any longer. At that time, let me leave! As long as you can promise me that, I will do everything in my power to help you reach the Immortal Realm. That will help you, and it will also help me."
"There's one more thing you have to promise me."
"What is it?"
"My Lotus Avatar, as well as one of my disciples, learned the path of the sword embryo. You have to tell me how to escape the restraints of this path, and, of course, give me the complete cultivation method of your Primordial Sword Dao. If I'm to gain complete control over you, I'll inevitably have to destroy your physical body as well. Your several sword-embryo avatars cannot be left alive." Lu Xiaotian said.
"Helping them escape the restraints of the sword embryo won't be difficult. As for the complete cultivation method, I only have it up to the Celestial Immortal level. After that, everything depends on one's own deductions. How far one can go will also depend on one's fortune."
After a moment, the Primordial Sword Demon said, "Destroying his physical body would naturally be a great loss to him. But without doing so, Lu Xiaotian would not be able to control him, and the foundation of their transaction would disappear. No matter how much help he could provide, Lu Xiaotian would never let him remain. Given his current condition, he had no room to refuse. He could not even preserve