The entire series is an amazing meld of epic fantasy and philosophy that delves deep into topics surrounding human nature and human existence. We had a similar discussion on reddit[0] a few months ago and i'll summarize it here. You'll find topics like violence and its relation to power,civilization as violence against nature, phenomenology, existentialism versus essentialism. Arguments for anarcho-primitivism, arguments against anarcho-primitivism. Mutualism versus individualism versus collectivism. Class struggle and class consciousness.
The entire series is a piece of art. It also happens have a myriad of badass characters appearing and disappearing throughout the novels, so there's always something to look forward to in the next book.
[0]https://www.reddit.com/r/Fantasy/comments/d1vfs3/philosophy_...