A Dragon's War

Dragons and humans once lived in harmony, creating architectural and technological marvels, thriving and expanding their empire with the help of the dragons.
For a while, it seemed like humans and dragons could've lived together in peace.
That was until one human became too greedy for his own good, and created his own mechanical marvels along with a new, enhanced army of super soldiers.

WARNING: intense blood, gore, language and violence and possible dark themes.

I shall be leaving little film references in some chapters - see if you can find them. And for an extra challenge, try tell me what film it is.