Black Dragons - The Fifth God, #1

When the 1, 000-year-old sorceress Hagala finds her way back to the world that exiled her, she decides that this time she won't come alone. He brings with him terrible dragons. And he wants to bring a terrible deity. For that she needs the Key. Furious after unrequited love, and after centuries of exile, she feels like she has nothing to be happy about anymore. Therefore, she decides to take revenge on the world and the people who turned their backs on her.
Who betrayed her. Learning that Hagala has returned, and knowing how powerful she is, a group of powerful people realize that they must organize themselves and stop her from planning to destroy the world. Again. And they have to find the Key before she does. But the gods have their own plans, so they put the fate of the world in the hands of ordinary mortals who don't even realize that they are part of a huge conflict.
Four orphans, best friends, return to the place where they grew up, not knowing that they will be a stumbling block to the old evil. There, their fate begins to unravel through new friends, enemies, incredibly powerful magic, ancient dragons and unexpected loves. Before them are impossible choices between love and power. Can winning a knight tournament be the solution to a cataclysm that destroys an entire kingdom? Or is much more needed?