Basically, you are sent to a prison colony for having the natural ability of using source. Your first job is to escape then survive in the swamps. You escape the island then have to put the pieces together to become the new "divine". You then go to another island to do this but it's infested with an old enemy and things happen. Then off to the city of Arx to continue your quest. I think I did this without spoilers. If you want answers on story as you go, just ask here or on GoG. I'm not an expert nor an insider but I've got about 1500 hours into the game so I should know the story by now less the really detailed details.
