Odin wasn't the easiest god to work for. To join his team, you either had to be hacked to death on a battlefield or become a wizard. Arthur chose the latter, although the initiation was no less gruesome-just have your heart ripped out of your chest to be anointed with Odin's magical blood. Easy peasy, right?After the heart-ripping thing, the job was pretty sweet: the benefits of eternal middle age, the occasional fight with a rival wizard to keep...