The immortal energy condensed in those threads slowly entered Fei's body through the suction of his Silver Spiritual Roots. This energy passed through his meridian and entered his dantian. He was already at the peak of the Houtian Realm. Till now, everything that happened in his body was based on Su Ling.
His golden core, fire law, spiritual sense, blood condensation, muscles, and skin refinement, and bone forging, everything was done based on Su Ling's body. Fortunately, her cultivation was already top-level, so he didn't get into any kind of problem.
As for Xiantian Realm, he needs to condense true energy liquid from true energy. This is just like his spiritual liquid, except in higher form. Normally with his dantian condition, he might take years to fill it with true energy liquid with the help of normal energy.
