The prophecy contains the history of the first Game (Divine Divinity) and "Child of Chaos" the back story of Beyond Divinity. There is no mentioning of the Source, since Source was introduced in Divinity: Original Sin, but they explain what the Council of Seven and the Lord of Chaos is.
They are a fun read. Just don't be confused when you read, that they call "Rivellon" a country and not a world. It started out as the dukedom of Ferol in the first game, then it became the name of whole world^^.
Thus, The main problem of writers is to make narrative which will be interesting both newfags and oldfags.
There were no such problem in D:OS because its hystory barely connected with previous games. By the way, It seems like Dragon commander almost has no such connection.
But they intend to place D:OS 2 in centre of original trilogy.
E.g., during Kickstarter company, I've read about some "Divine order" in every second update and can't understand what is that?
