I like the subtlety of the magic. That means that finding magic gear is probably going to be pretty difficult. How will people overall respond to high level casters who are painfully obvious? Or is this a case where magic is still there, but it's Gandalf type magic where it's used only when it's necessary?

Is there any way for these mortal gods to become immortal? Or do the remaining immortals just keep appointing the leaders of mankind? Either way, cool stuff.