I've recently read R.F. Kuang's 'The Burning God' and I was not emotionally prepared but I loved it. I would prefer books where someone dies in the end, and it doesn't have to be the main character like the above series. A good example of a side character dying while being destroying is mockingjay by suzanne collins. Please no spoilers on who dies, though, I enjoy the suprise.
by honeyingstars