I always like to see all the different project people come up with for FFXIV. Editorial design is actually one of my strong suits so I will give you some constructive criticism, this is by no way saying it's bad but more to help you gain a better understanding. I'm going to keep the feedback to design fundamentals and leave opinions on styling etc out of it as those are subjective opinions.

1) Your blacks are very harsh against the other elements in your designs, if you were to reduce this slightly these elements would probably feel more integrated into your design. I would say adjust your blacks to around C:0 M:0 Y:0 K:85%-95% if you're not using CMYK adjust accordingly with RGB.

2) The weight of the lines throughout the book are unbalanced, you have really thick strong lines and very week lines, you have thick lines becoming thinner on the next page. To be honest being able to find a good balance in the weight of design elements is something that can only come with experience, but when I started out I wasn't even aware that it was a "thing", so now you know :D

3) The spacing between the titles and body copy (text) is inconsistent across the document.

4) The column spacing in your tables is in consistent, easy fix this one, just use a shape to measure it out.

5) Your lines for the user to write on don't run parallel to each other, easy fix again.

There are a couple of other things I could probably pick out but I'm trying to keep it at the basics for now. Overall it's not a bad job and for a good cause, my friend had a lot of problems with bad anxiety through University so I've seen how difficult it can be first hand.