So I'm working on my second fantasy novel. I've got notes for most of the chapters written down and a few chapters written but I'm wondering if I need some kind of central antagonist. In the first arc the MC survives several assassination attempts, in the next main arc its a battle for survival journeying across the jungle, and the final arc is filled with danger and mystery. In my mind it all works. But I'm wondering if the reader will need some kind of antagonist that needs to be defeated and overcome. I have various antagonists that exists for a number of small arcs. But there isn't someone running through the whole novel that is in direct opposition to the MC. What do people think do you need a main antagonist in a fantasy book?