A84: Lightning Mace is a weapon style found in Complete Warrior that lets you make an extra attack every time you threaten a critical hit. The truly abusive way of using this is to combine it with an 18-20 threat range Aptitude weapon (ToB), Blood in the Water stance (ToB), Roundabout Kick (OA), a lot of attacks (say, from dual wielding repeating splitting aptitude great crossbows), and a method for extending the critical range of those weapons (keen, kaorti resin, Disciple of Dispater, etc.) for just a whole ton of attacks.