The Devious Book of Fumbles & Crits: A 4th Edition D&d Supplement

Lady Luck ~ she is a fickle mistress. Why not take her out and get her something nice?

Actually, she better be in a hot bath with a glass of wine while you are rubbing her feet, because with "The Devious Book of Fumbles & Crits," if you roll a "1" she can make your life a living hell...literally.