Ordinary (?) young people facing gods and other impossibly powerful foes.
Harry Potter and the Sorcerer's Stone by 
The Grave Robber's Apprentice by 
William and the Lost Spirit by More scaly, winged monsters than you can shake a flaming sword at.
The Story of Dragons and Other Monsters by 
Here Lies Arthur by These stories are spun off of Arthurian legend.
These stories feature heroes who may or may not be the one person meant to fulfill a certain prophecy and save the land from disaster.
An Ember in the Ashes by 
The Fairy Ring, or, Elsie and Frances Fool the World by 
Undertow by 
Daughter of Smoke and Bone by These stories deal with divine and supernatural struggles between good and evil, which are not always easy to distinguish.
The Demon's Lexicon by 
