This is my main build for Akali. It delivers massive amounts of ability power at the end but because of the magic penetration she can deal loads of dmg in about mid game. With her passive, by the end of the build she will be doing over 220 dmg per physical attack based on over 100% added magic damage. I don't do the soul stealer because Akali has a tendency to die in big battles. 1 vs 1 she will reign supreme. She ends with over 3000 hit points over 600 ability power and a base of about 125 physical dmg. Remember her passive though and its all very deceiving. give it a try! I know I usually finish my games with around 20 or more kills.