22 books • 6 series
Book #1: The Invisible Empire
Book #2: The Serpentine Assassin
Book #1: Transformers: IDW Collection Phase Two Volume 1
Book #2: Transformers: IDW Collection Phase Two Volume 2
Book #3: Transformers: IDW Collection Phase Two Volume 3
Book #4: Transformers: IDW Collection Phase Two Volume 4
Book #5: Transformers: IDW Collection Phase Two Volume 5
Book #1: The Sagard the Barbarian
Book #3: The Crimson Sea
Book #4: The Fire Demon