Dragon's Glass. Archaeologist, #2

Mael Corentin and Dragon King Vaaltim are searching through the many mysterious documents left to Mael by his late uncle Paul, but one stands out. There is a magical map leading to lost stolen dragon treasures, while the map has the uncanny ability to change at will. During the years before the first rogue vampire wars, it seems a warlock had engaged an enterprising demon to steal the dragon's most prized possessions; the Dragon's Glass, along with the enchanted Dragon Glass book.
However, the demon was greedy, demanding more, but instead was mortally wounded by the angry warlock. The demon managed to escape with the book before he died, using his magic to protect his stolen treasure even in death. Retrieving the book will reveal the Dragon's Glass location, but oddly the dead demon must be killed a second time before that can happen. There is only one little catch. Mael is severely warned that the demon's dark magic can kill him if he even glances at the demon's spelled remains, while his enchanted crypt contains many other deadly surprises of its own.
Beginning their convoluted hunt, they soon discover two more ancient, enchanted dragons whose lives depend on finding the lost objects to end their curse.