The process of resurrecting Elysia was not difficult for Fang Zheng.
Of course, only Fang Zheng would dare to say "not difficult".
First, he returned Elysia's soul to her own body. Then, using his Time Dragon's power, Fang Zheng "retrospected" Elysia's body to before her death. However, this was far from sufficient; Time Retrospection could not unify the soul and body, so Fang Zheng had to "cut" a piece of soul from Precia and fuse it with Elysia's remaining soul.
If a comparison were to be made, it was more like an organ transplant surgery between family members. Fang Zheng chose Precia because she is Elysia's mother, making their soul waves more compatible.
Next, Fang Zheng only needed to use his power as the "Third Magician" to materialize the soul, and he could resurrect Elysia.
