We have no idea what the Book of Principles can/will do. That having been said, it's just as likely that the book itself will kill as the procedure to get it. That also being said, it's just as likely that getting the book will be a spectacular event and grant the finder eternal power. That also being said, it's just as likely that getting the book will be more mundane than fighting the shades in Tutorial Land and prove nonprofitable to the discoverer. etc, etc, etc....
This is precisely why I said that sometimes it is better to just "wing it." Thus far, we mostly agree that the Book of Principles is something amazing and not just a book that gives precise information on the principles (which would be pretty amazing..). Ergo, it follows that we should be more willing to take the risk in the assumption that the result is good, rather than in the assumption that the result is bad. Or rather, in the hope that the result is good.