Can you recommend some popular fantasy fiction trilogy books?

Sure. 'A Conjuring of Light' by V. E. Schwab. It's the final book in a trilogy and wraps up the story in a very satisfying way, with lots of magic and complex characters.

The 'Lord of the Rings' trilogy by J.R.R. Tolkien is extremely popular. It takes readers on an epic adventure through Middle - earth, filled with hobbits, wizards, and battles against evil. Another great one is 'The Hunger Games' trilogy by Suzanne Collins. It's set in a dystopian future where a young girl named Katniss Everdeen becomes a symbol of resistance. And then there's 'His Dark Materials' trilogy by Philip Pullman, which is a complex and imaginative exploration of different worlds and the nature of the soul.

Sure. 'The Cruel Prince' by Holly Black is quite popular. It has a great mix of political intrigue in a faerie world and a slow - burn romance between the main characters. Another one is 'Serpent & Dove' which features a witch and a witch - hunter who end up falling in love in a world full of magic and danger.

One popular book is 'The Name of the Wind' by Patrick Rothfuss. It has elements of mystery as Kvothe's past is full of secrets and the world is filled with magic. Another is 'The Magicians' by Lev Grossman. It combines the mystery of a magical world and the characters' journey to understand it.

One popular one is 'The Hunger Games' by Suzanne Collins. It's set in a dystopian future where teens fight to the death in an arena. Another is 'Harry Potter' series by J.K. Rowling, which follows the adventures of a young wizard. Also, 'Percy Jackson and the Olympians' by Rick Riordan is great. It's about a boy who discovers he's a demigod and goes on quests related to Greek mythology.

There are quite a few. 'A Song of Ice and Fire' by George R.R. Martin has elements of the supernatural with things like the Others. Also, 'The Chronicles of Narnia' by C.S. Lewis is a classic. It takes readers to the magical land of Narnia where animals can talk and there are all kinds of magical beings. Then there's 'His Dark Materials' by Philip Pullman which has daemons and a lot of other supernatural elements.

Sure. 'The Mortal Instruments' series is really popular. It's set in a world where Shadowhunters fight demons. The main character, Clary, discovers she has a special ability and gets drawn into this dangerous and exciting world.

There is the 'Outlander' series which has been made into a trilogy of books (and also a TV show). It tells the story of a World War II nurse who travels back in time to 18th - century Scotland and falls in love with a Highland warrior. It has a great blend of history, adventure and romance.

The 'Millennium' trilogy by Stieg Larsson is also great. It features the character Lisbeth Salander, a brilliant but troubled hacker. The trilogy combines elements of mystery, thriller, and social commentary as it delves into issues like corruption, violence against women, and corporate misdeeds. It's a page - turner that keeps you hooked from start to finish.

One popular science fiction trilogy is 'The Foundation Trilogy' by Isaac Asimov. It presents a grand vision of a galactic empire's decline and rebirth. Another is 'The Hitchhiker's Guide to the Galaxy' trilogy by Douglas Adams. It's a hilarious and mind - bending series. And 'His Dark Materials' trilogy by Philip Pullman is also well - known, with its complex world - building and exploration of deep themes.