Furyborn is a tough character to put into words. Basically, it's about two girls who are both part of a prophecy and are separated by a millennium. And we hear about the impending battle against the angels and how the kingdoms ended up in this situation from both of their viewpoints.
It can be a little perplexing at first. There's a lot of conversation about elementals, a long list of characters/saints, and two different points of view that span a millennium. However, after the first 100 or so pages, it becomes more understandable.
The characters were all well-developed and written with a casual variety that I appreciated in a high fantasy book. There was some LGBT+ material, but it was written in such a casual manner that you may have skipped it. But, what if I told you that I liked it? And, even though it wasn't the main emphasis, it was good to have. The female characters in the book were also powerful.