It was an indescribable feeling. Even though he had already experienced his soul leaving his body once before, undergoing the sensation again still felt beyond words. This was especially true because the last time had been passive, whereas this time, he was actively initiating the out-of-body experience.
Most importantly, this time, his soul was enveloped within the pale gray flames of the Celestial Tomb Mark. Everything before his eyes, including his own physical body, vanished without a trace. Unlike his previous experience in the World Tree Secret Realm, his soul, accompanied by the Celestial Tomb Mark and carrying the small black sword, gradually turned transparent and faded away.
