Yu Luo had transformed into Wang Ziye.
This was soul transference.
Soul transference is a highly difficult form of knowledge. It's not about using one's own soul to seize another's body—which is called possession, leaving the nature of the soul unchanged and the lifespan as it was.
Rather, soul transference involves taking the target's soul entirely, turning their consciousness into one's own, while abandoning all previous cultivation, and fully inheriting the other person's cultivation and lifespan.
If the one whose soul is taken is a mere mortal, then one also has the cultivation and lifespan of a mortal.
This is soul transference.
Yu Luo stood up, and a water mirror condensed out of thin air.
The mirror reflected Yu Luo's face; he was still himself, only the person had become new.
"It wasn't easy," Yu Luo sighed.
This act of soul transference was also a narrow escape from death.