Trollhunters. Tales of Arcadia from Guillermo Del Toro

"For centuries, Changlings have recorded the history of Trolls and Gumm-Gumms in The Book of Ga-Huel. This ancient tome is, literally, a living document with new entries mysteriously appearing--or disappearing--in it. When Trollhunter, Jim Lake, Jr., gains possession of the book, he and his friends are fascinated by what they discover. But when a new passage appears and it points to the death of a beloved friend, the team must race against time to uncover the invisible force predicting a future no one is willing to face"--Provided by publisher.

"Jim travels back in time and encounters Gogun the Guardian, hailed as the bravest Trollhunter who ever lived. However, Jim is shocked to discover that Gogun is inept, unskilled, and terrified of everything and everyone. Jim knew when he was chosen as Trollhunter he would have to save mankind in the present, but he never realized he was responsible for the past as well. The fate of the world is a lot of responsibility for a fifteen-year-old--but luckily Jim is up to the task; as long as he's home in time for dinner"--Provided by publisher.

"The wizard is discovered but at what cost? Jim and his friends have finally found Merlin the Wizard, but at a terrible cost. One of their teammates has fallen in battle, but Jim doesn't have time to grieve. He has to stop a feud between the River Trolls and the Garden Trolls, which has been going on for centuries. Once again the fate of the world is on Jim's shoulders. Is he up to the task?"--Provided by publisher.

"When presented with one more task from Merlin, Jim Lake, Jr., isn't too worried. How bad could bathing in a magical elixir be? It almost sounds soothing. Hopefully he'll be able to relax and get away from it all. Oddly enough, it does transport him, just not in the way he imagined. Suddenly Jim finds himself in the cold, dark woods and he's not alone. The recently resurrected Angor Rot is there with a score to settle. To make matters more complicated, Jim has suddenly grown taller, stronger, and is sporting some very Troll-like hair, eyes, and teeth. All of this leaves him questioning Merlin's magic, trying to get a handle on his new body, and wondering how he'll get away from Angor Rot. Talk about an awkward stage!"--Amazon.com.