User blog comment:KarasuGamma/Ahri's Nonexistent Role/@comment-6301771-20130410053909/@comment-6301771-20130410061054

Rylai's and Liandry's are pretty much necessary on her. They grant both health for dealing with the inevitable burst she has to go through to get within optimal range, and the utility her kit needs. Lich Bane allows her to get more damage through with her burst, and amusingly has better AP scaling than most of her skills, and when it comes to fixing her CDR issues Athene's or Morellonomicon both function well enough.

Abyssal Scepter is strong on her but shouldn't be built until late game, if at all. Void Staff doesn't help her deal with the fact that she just lacks damage: Penetration won't help her much. Her scalings are far too poor to invest in a Rabadons, WotA doesn't actually help her much unless she has other mage-y teammates, and Furor...*Shrugs*