James lake Jr was trying out a mysterious necklace that allows him to travel through time and space but then actually sends himself Aaarrrggh and Blinky to a strange world filled with.............dragons???? Picture doesn't belong to me and neither does How To Train Your Dragon and Troll Hunters

Douxie had been given strict orders by Merlin to not engage with the children of the gods, and he'd followed that rule dutifully for eight-hundred years. But everything changed when he met Carter Howard. He decided then and there to protect him with his life. Whatever may come. (Book 1 - 4 of Half-Bloods and Hunters)