It's a document well worth paying for. The rules provided are discussed in sufficient depth to be useful, but where this rule shines in particular is the flavor text. They have the quality of putting a nice vivid image in your (and hopefully your players') mind. Make the players see that same image and you have an epic mechanic that allows for your characters to shine in the endgame, even when their lights are about to be snuffed out. Thanks!
[5 of 5 Stars!]