So the general overview of the world is that their is a pantheon of gods called Innhold, and a mysterious cult leader named Noma used all his magic and lives of followers to try and summon him. However the spell went wrong and kill Innhold and earth bound the other gods. Now the two sons of Innhold are at world over the throne.
This affects the earth world, whhich has two main factions (either different kingdoms or factions within the kingdom). These factions are at war now being affected by the gods war.
Lastly, the world is set in a large archipelago and the god of the sea, Hav, is neutral in the world.
The overall plot would involve the players exploring the world, finding out more about the factions and being able to choose who wins the overall war, whether thats joining one faction or bringing them together. Also, they could rally behind Hav and bring him to be the new leader.
Thoughts? Happy to explain deeper thoughts in comments