I realized that almost all the main characters have a special item that symbolizes (and contains?) a certain part of the hero’s soul - supplanted/forgotten/unknown.

And almost all of these items break at some point. But it is from this break moment that the path of assimilation of this lost part begins.

Bai Jiu and his paranormally spacious box. Just like Bai Jiu himself - keeps much more secrets than you can imagine looking at him from the side. Can even contain an additional person. (I don't remember the fate of Bai Jiu's box, if someone remembers it would be interesting).

Wen Xiao and baize token. For a long time, the Wen Xiao felt like an application to this relic, helpless without it, and only after it broke and she spent 300 years to grow a new one, it really became her own.

Li Lun and his drum. The gift of youthful love and a symbol of the innocence and some childish spirit, later converted into weapon. It breaks when Li Lun occupies the body of Bai Jiu - the body of the child - and begins the path of some real transformation.

Zhuo Yichen and his blue cloud sword. It breaks when Yichen's inner contradiction is revealed - and then, like with baize token , he creates a new sword. And creates it with the help of Zhao Yuanzhou - so this new sword is a “product” of their relationship, not predecessors.

Zhao Yuanzhou and his umbrella. Correct me if I remember wrong, but Yuanzhou's umbrella also breaks on the same day as the sword? And from this day we never see Zhao Yuanzhou completely losing self -control (he was close at the moment when people attacked Yichen, but resisted).

Pei Si Jing and a doll of her brother.  Pei Si Jing all her life built her identity on the role of the sister-defender. But in the end, she herself killed her brother. And this fundamentally leaned her ability to fight the demons. The memory of her brother, busy with magic and tied to a doll, was her cruttle for a long time - more likely not as his soul, but as part of her soul tied to her role as a sister. But at that moment when she gained courage to fight the demons herself, this crutch breaks.

And I find this whole theme of "Sometimes you need to break to become a whole" closely related to experiencing yourself as anomalies.

When you have a part in you that causes a painful contradiction, we tend to isolate this part, as if to put in a separate box. And get out of there only for a while and in an urgent need. And it seems that this mental "box" is felt as protection, but at the same time it is a prison.

Ultimately, it usually has to be broken. And even when you are really ready for this, it can be felt in the moment as a risk of self -destruction, final loss of yourself. Although in fact, it is after this that you can find yourself fully.

"When you have a part in you that causes a painful contradiction, we tend to isolate this part, as if to put in a separate box. And get out of there only for a while and in an urgent need. And it seems that this mental "box" is felt as protection, but at the same time it is a prison." 

So true.

Nd damn I didn't notice that thing with pei sijing nd her brother, the timing is insane so perhaps that really was intentional, her emotional crutch breaking the moment she finds her resolve, thats...kinda really depressing somehow 🥲. Nd right, the cloud light sword being broken nd then reforged by zyz, making it sth of their own, when all this time it was a legacy of love nd care from yinglong to bingyi, another layer of fate damn. Really feels like it was all setup lmao. 

Zyz's umbrella broke?  Really? I didn't see it break wth

 Acid Mana:

"When you have a part in you that causes a painful contradiction, we tend to isolate this part, as if to put in a separate box. And get out of there only for a while and in an urgent need. And it seems that this mental "box" is felt as protection, but at the same time it is a prison." 

So true.

Nd damn I didn't notice that thing with pei sijing nd her brother, the timing is insane so perhaps that really was intentional, her emotional crutch breaking the moment she finds her resolve, thats...kinda really depressing somehow 🥲. Nd right, the cloud light sword being broken nd then reforged by zyz, making it sth of their own, when all this time it was a legacy of love nd care from yinglong to bingyi, another layer of fate damn. Really feels like it was all setup lmao. 

Zyz's umbrella broke?  Really? I didn't see it break wth

I'm not 100% sure, because it's not very clearly shown, but I think ZYZ's umbrella was also destroyed in that fight with ZYC. And then - as far as I remember, we never see ZYZ using an umbrella again. In every subsequent battle, he just casts magic with his hands. But my memory may be failing me. But if that's true, then it does make sense. The umbrella with the dagger hidden in it symbolized ZYZ's attempt to protect the world from himself and to protect himself from this more aggressive and passionate part. But he goes a long way in appropriating this part. And after that fight with ZYC, we don't see him completely losing control anymore.