Sorry for late response. Got busy irl.
As for cheatss, it seems things got changed since the last time I visited the chinese site.
Now cheats are locked behind a login that I sadly cannot made an account for because it literally requires a legit...
I can confirm that essences can be used an infinite number of times (though it will always display as only having one essence).
Thank you very much for the codes. Of course, as soon as the codes started to work, I found the update with the DLCs...