The Dragon Engine: The Blood Dragon Empire, Book 1 (Unabridged‪)‬

Five noble war heroes of Vagandrak get drunk one night and sign a contract - to journey to the Karamakkos in search of the Five Havens where, it is written, there lies untold abandoned wealth and, more importantly, the three Dragon Heads, legendary jewels claimed to give unspeakable power and everlasting life to those who wield them.

But the Dragon Heads aren't what the adventurers think they are, and the world has not encountered their like in generations! Think Smaug was fierce? You ain't heard nothing!