Shizuku just stared at hajime as he gave off his extremely simple explanation. From the stare, it was clearly saying, [Is that all there is to it? Ahh?], with an insecure look. In place of Hajime who had an expression that his motivation for explaining was 0, Kaori decided to explain with an amazed expression.
[Ehhto ne, Shizuku-chan. You know that the magic we’re using now a degraded version of the forgotten magic from the past called Age of Gods magic right?]
[......Yes. I’ve studied some of this world’s history. Its the magic that appears in the myth about how this world was created? Rather than the current attribute magic, they were more fundamental in useage…...wait. Do you mean to say that it’s that kind of thing? The Age of Gods magic that Nagumo and you guys have is the spirit type…..a power that allows you to interfere with a person’s soul? With that, the spirit of the dead Kaori was protected and settled in a different body right?]
[Right! As expected of Shizuku-chan]
For some reason, Kaori was sticking out her chest proudly. In fact, the rate of Shizuku’s brain being able to process things was fast. Hajime had also known of this before but, inside of himself, he was once again impressed.
[But, why in that body? Was Kaori’s body no longer alright? I thought that you guys could somehow manage to heal up the wound that was inflicted on her heart with recovery magic though……]
[Ahh, the truth is, Kaori’s body is completely healed and it was possible to return her soul to it]
Spirit magic was mind-blowing Age of Gods magic where you can literally stay immortally young through continuously fixating your own soul.
By “fixating” it was magic which preserved the dead spirit that was interfered with in order to not allow it to deteriorate nor disappear, at first, this was what Teio performed on Kaori. However, it was lucky that Teio made it on time because it’s ineffective if several minutes have passed since death.
By “establishing”, just as it says, regardless of the fixated spirit, they’ll be established whether its as organic or inorganic matter. Bodies which have started decaying would still cause them to die once again even if they establish themselves because it won’t be suitable for survival, however, it’ll be possible with a healthy body, it’s also possible to leave the wedge of time and become immortal like Miredei Raisen who established herself as a golem.
Obviously this magic isn’t so simple that it can be done without proper testing and training. It was successful precisely because Yue and Teio were naturally talented at magic. Even still, it took 5 whole days to properly establish.