**Utgard, the the Scandinavian sirens capital is not know for her architectural decoration but for her habitants. The Scandinavian sirens, the Margygr, are know for their cruelty, strength and knowledge in mechanics. Like in most of the sirens society, the females are the one leading and the males see has nothing, except if they have interesting abilities. Margygr can live for hundreds years.

Viktor Njördson is the prince of Utgard, but has a male he can't pretend to the throne. It's his twin sister, Hildr who is going to be the queen. Viktor always keeps a stern face and smile rarely and only to the one he trust (his sister, his grandmother and his Forge workers). His sister and him are the strongest Margygr due to their orca tail, which is giving them a great strength and the ability of controlling salt water and making ice. He uses an ice hammer to fight, and gain the surname Mjölnir. He can be cruel, like the other one of his people. It's in their blood. But he's also an inventor. He likes to create things and is working on automate.

20 years ago, a war starts with the Atlantic sirens, the Morganez. The Margygr almost win, but the Morganez used river sirens, the Imanja who can control the sea animals and take Utgard, killing all the Scandinavian sirens. Viktor lost his sister, his grandmother, his mother (but he didn't like her so he doesn't care about her), some friends and his population. He managed to make 10 000 of his people to escape, but got captured by the Morganez who tortured him fro months, before he managed to escape.**