[quote=KabenSaal]
So how does magic work now the sun is corrupted?
[/quote]

It's largely unaffected, at least as of this point. Think of the Ripper's destructive magic as food coloring, and the Source's pure magic as water. It only takes a few drops of food coloring to contaminate a whole jug of water and make it look red, but the thing is still mostly water.