Sorry to say this, to all editor when make a new page or new sentences/spoilers/statements from light novel please state the references.
It's not hard to do that, press edit on the page(not edit page at contribute or classic editor) at the end of sentences press "insert references" and then state where you get the information. Example Volume 6, Chapter 1 (linked) and then it will show small number [1] at the end of sentences. Example
Lastly, at the References tab press "insert reference list". Then all references will show automatically.
References are important because to enable readers to consult the original source independently and also to validate what you are writing, by referring to documented evidence.