Dracula Untold
Before the Renaissance, Vlad Drăculea is the Prince of Wallachia and Transylvania. As a child, he was a royal ward in the palace of the Sultan of the Ottoman Empire and was trained to be a soldier in the Sultan's elite Janissaries corps, where he became their most feared warrior. He was called "Vlad the Impaler, Son of the Dragon", after slaughtering thousands by impaling them on spears, but became sickened by his own acts and abandoned his past.
Now ruling his domains in peace, Vlad and his soldiers discover a helmet in a stream and fear that an Ottoman scouting party is preparing the way for invasion. The stream leads to Broken Tooth Mountain, the top of which has a cave carpeted in crushed bone. Within the cave, they are attacked in the dark by an inhumanly strong and fast humanoid creature, killing Vlad's retinue. Returning to his castle, Vlad learns from a local monk that the creature is a vampire, a Roman from the days of the Empire, who was tricked by a demon for personal success and great powers, but was trapped in the cave as price for this. Vlad celebrates an Easter feast with his wife Mirena and son Îngeraș, when an Ottoman contingent arrives at the castle. Vlad offers them the usual tribute payment of silver coins, but the emissary wants an additional tribute of 1,000 boys to be trained as Janissaries. Vlad refuses. Mirena believes Vlad can convince Sultan Mehmed II to show mercy. Vlad offers himself in place of the boys; but Mehmed refuses and demands Vlad's son in addition.
Knowing war is coming, Vlad returns to the Broken Tooth Mountain cave to seek help from the vampire. The vampire tells him there are consequences and offers him some of his blood, which will temporarily give Vlad the powers of a vampire. If he resists the intense urge to drink human blood for three days, he will turn back into a human. Otherwise, he will remain a vampire forever, and the ancient vampire will be freed, the seal on his cave broken by having given the darkness a worthy offering to plague the world like himself. Vlad accepts the offer. He discovers that he has the ability to transform into a cloud of bats. When he returns to Castle Dracula, the Ottoman army attacks, but Vlad single-handedly kills them all. He then sends most of the castle's subjects to Cozia Monastery for safety.