[8] The golden age of children's fantasy, in scholars' view, occurred in the mid-20th century when the genre was influenced by J. R. R. Tolkien's The Hobbit and C. S. Lewis's The Chronicles of Narnia.
[9][10] In the vein of Narnia, the post-war period saw rising stakes and manifestations of evil in the works of Susan Cooper and Alan Garner.
[13] In the late 1990s, J. K. Rowling's Harry Potter led to a commercial boom in the genre, reviving older authors' careers and spawning many imitators.
[14][15] A concurrent success is Philip Pullman's His Dark Materials, a darker, realistic fantasy that led to a corresponding trend in a new young adult market.
[16][17] The protagonists are usually children or teens who have unique abilities, gifts, possessions or even allies that allow them to face powerful adversaries.