Riven's passive I let stack/build up, and not use, so I could get that extra damage. I was able to get up to 102 extra damage - Level 18 (ULT-122 extra Damage).I have a lot of cool-down reduction because having Riven's abilities faster help secure those kills in ganking or 1 v 1 an opponent(Q = 7.8 sec, W = 3.5 sec, E = 3/3.5 sec, and ULT = 30 sec).I also tried focusing on Riven is staying with the opponent, so what i did is, I got Upgraded boots (Whatever boots you prefer) Furor. What Furor does is "Upon dealing damage with a single target spell or attack (On Hit) grants 12% movement speed that decays over two seconds." So in other words every attack you gain 12 movement speed each time (does not stack up).One thing i noticed about Riven's is that she loses a lot of health quite fast, so i added a Blood Thirster, which is recommended, into her build for life-steal.