What are the most popular fantasy fiction books?

Definitely 'Harry Potter'. It has a huge fan base all over the world. The story is engaging and has been adapted into successful movies. 'The Lord of the Rings' is also extremely popular. It has influenced a lot of modern fantasy works. Its epic battles and detailed world are very appealing.

The 'Inheritance Cycle' series which starts with 'Eragon' is quite popular. Also, 'A Song of Ice and Fire' has some dragon elements that are really appealing. And 'The Earthsea Cycle' has dragons that play important roles in its magical world.

I think 'The Grace of Kings' by Ken Liu was also quite popular. It has a great blend of Asian - inspired mythology and science fiction elements. It's about kingdoms and power struggles in a world that has some advanced technological aspects.

I think 'The Fifth Season' was quite popular. It won a Hugo Award, which is a great indication of its popularity and quality. Its unique take on a post - apocalyptic world really caught readers' attention.

Probably 'Ancillary Justice' too. It was praised for its fresh ideas regarding AI and its exploration of different forms of consciousness. The story's scope, spanning across different planets and cultures in a far - flung future, made it stand out among other books in the genre in 2013.

Probably 'The Fifth Season' was quite popular. Its unique take on post - apocalyptic settings and magic made it stand out. People liked the way it explored different cultures within its world.

The 'Mistborn' series by Brandon Sanderson is quite popular. It has a unique magic system. The story follows Vin, a street urchin, who gets caught up in a grand plan to overthrow an evil empire. The plot twists are amazing.

One of the most popular ones is 'The Lord of the Rings' series by J.R.R. Tolkien. It creates a vast and immersive world filled with different races like hobbits, elves, and dwarves. Another is 'Harry Potter' series by J.K. Rowling. It follows the adventures of a young wizard in a magical school. 'Dune' by Frank Herbert is also highly popular. It has complex world - building and political intrigue set in a far - off desert planet.

The 'Outlander' series by Diana Gabaldon is also well - loved. It combines time - travel which is a science - fiction concept, with a very passionate historical romance. Claire, a modern - day woman, travels back in time to 18th - century Scotland and her relationship with Jamie is iconic.

The 'Harry Potter' series is extremely popular. It's a classic YA fantasy that has captured the hearts of millions around the world with its magical school, Hogwarts, and the battle between good and evil.