Glommus the dragon dies when Tanu (inhabited by Vanessa) chops his head off.
The demon prince Navarog gets eaten by the dragon Raxtus, Glommus gets his head chopped off, and Siletto dies when she is touched by the unicorn horn.
Fablehaven 4: Secrets of the Dragon Sanctuary
Gavin turns out to be the dragon prince, Navarog in the 4th Fablehaven book, Secrets of the Dragon Sanctuary.
In "Fablehaven: Secrets of the Dragon Sanctuary," the character Vanessa Santoro dies after sacrificing herself to save Kendra from a deadly trap set by the Society of the Evening Star.
One of Kendra and Seth's protectors and valuable allies in Fablehaven Secrets of The Dragon Sanctuary and Fablehaven Keys To The Demon Prison.
The setting of "Fablehaven: Secrets of the Dragon Sanctuary" is primarily the magical preserve known as Fablehaven, where mythical creatures are protected and hidden from the outside world. In this book, the characters also visit the Dragon Sanctuary, a separate location where dragons are kept and cared for. The story unfolds in these fantastical environments, full of wonder and danger.
Siletto the poisonous dragon dies when she is touched by the unicorn horn.
It is already out and you better read it for if you shall not you shall die.
The demon prince Navarog dies when he gets eaten by the dragon Raxtus.
Dougan was eaten by Navarog/Gavin who was later eaten by Raxtus
"Fablehaven: Secrets of the Dragon Sanctuary," the fourth book in the series by Brandon Mull, contains approximately 605 pages in its hardcover edition.
The fifth book of Fablehaven will be called Keys To the Demon Prison. It is in the back of the fourth book, Secrets of the Dragon Sanctuary. The fifth book of Fablehaven will be released on March 23rd, 2010.