Okay, here's a question for you guys. You can have any single charm from any book, without regards to prerequisites. You can only have the one charm, (so taking Triumphant Howl of the Devil Tiger won't give you access to the associated excellency or charm tree), but you can use it at will. What would you choose? I'm tempted to say Efficient Secretary Technique, for the ability to have pretty much all of the world's knowledge at my fingertips.