The Legion of Flame (The Draconis Memoria)

Survival is the only currency...
 
For centuries, the vast Ironship Trading Syndicate relied on drake blood—and the extraordinary powers it confers to those known as the Blood-blessed—to fuel and protect its empire. But when the drake blood lines began to fail, a perilous expedition was mounted to secure them.
 
Claydon Torcreek survived the fraught mission through uncharted lands in pursuit of a myth that might have secured his people’s future. Instead he found a nightmare. The legendary White Drake was awoken from a millennia-long slumber, with a thirst to reduce the world of men to ashes, and the power to compel an army of Spoiled slaves to do it.
 
Spurred on by a vision he desperately hopes he can trust, Clay and rebel naval officer Corrick Hilemore hijack a warship and head towards the icy southern seas, searching for an ancient secret that may give them and their allies a fighting chance.

They are aided on another front by Blood-blessed agent Lizanne Lethridge. The spy and assassin will use her diplomatic status to infiltrate deep into enemy territory on a quest for a device to save them all.
 
As the world burns around them, and the fires of revolution are ignited, these few Blood-blessed are the last hope for all of civilisation.