To use the correct adjective with the phrase in detail, think about fewer vs less in number vs amount - but remember in detail means specifically or completely already. I have read your … What's more is an expression that's used when you want to emphasize that the next action or fact is more or as important as the one mentioned.

What's more, it brings more … The stories may be make-believe, but also much more than make-believe (that in the sentence): It will among other teach them the morals of the agta, the myths and how they see the world around them.