The Greystone Chronicles
Reading order
The Greystone Chronicles, Book 1: Io Online
The Greystone Chronicles #1
The Greystone Chronicles, Book 2: The Dire Lands
The Greystone Chronicles #2
The Greystone Chronicles, Book 3: Darkness Fallen
The Greystone Chronicles #3
The Greystone Chronicles, Book 4: Defenders of the Realm
The Greystone Chronicles #4
The Greystone Chronicles, Book 5: World at War
The Greystone Chronicles #5