The magic circle background affects readability badly, possibly scrap it. In some cases the phb has decoration images similar to that one at the top or bottom of the page with no text on it, if you move it and set "top and bottom" or "in line with text" you should get pretty much that result. Maybe instead of having the whole circle make only a quarter of it enlarged come out of the page. Some people might be annoyed about it going over the margin, but the phb does it all the time. Take the Ranger page 91 for example, there are tracks as decoration at the bottom-right of the page going over the margin. Or the top-left of the Rogue, page 96.
For the next version I would advise to use text boxes for the page number in the footer so that they are in the same position as the page numbers in the phb (in that little curve of the background image). Same for the "D&D 5 homebrew class | arcane warrior" thingie. Text boxes are in the insert tab, usually a bit on the right. The font of the page number can be styled like titles to look properly.
Something weird happened to the bold in the spell description, it looks kinda blurry, I wouldn't know why.
Pictures in a rectangle with background are easier to find, but they look weird when slapped on the pdf, for now it's ok, but personally I prefer looking for images with "transparent" set as a color in the search tools. The other thing to do would be modifying the pictures with background on photoshop to make sure they blend with the rest better, but I still have to learn how to do that.
All in all it still looks pretty good and it is a little more balanced as well. You tend to talk in a veiled way about mechanics in the flavor part, while also saying stuff that is technically wrong "Some arcane warriors start out seeking to master the ways of magic, only to end up wanting to hold their own in physical combat", this is not true, since they start at level 1 without magic but just some magical features that have to do with weapons, if anything their magic is blending seamlessly with their fighting. It can be true of someone multiclassing into an arcane warrior, but then you are not talking about your class anymore.
