Sabine barely managed to escape from Akros with her life. 

But the ocean isn't safe for someone whose power stems from the forests.

When their ship is attacked on the high seas and one of Sabine's companions is taken hostage, only an agreement forged by blood and magic may save her friend's life. 

With the dragon portal failing and the gods' magic threatening to destroy their world, Sabine must choose between following her heart or upholding a sacred oath.

The cost of ending a centuries-old feud may be higher than anyone expected.

All magic demands a sacrifice—even if it's hers.