User blog comment:Dj0z/Dj0z's Hybrid Miss Fortune Guide/@comment-5115433-20120522123122/@comment-4834593-20120523144521

"Riven doesn't AA all that much." So? She seems to have known that, and has build Bloodthirster (core, most Riven players buy it as first major item), Maw of Malmortius (core) and, at the moment the game ended, Chain Vest. Whatever she wanted to build it in, most likely it was an item that was nice on her. And of course the Merc Threads, which were also nice.

She knows she doesn't auto-attack much, she knows she scales heavily with AD, so she builds items that give AD but not AS or crits.

And Warwick was most likely going for Madreds Bloodrazor. His ult then deals bonus damage equal to one fifth of enemy health...