Originally Posted by MauxFire
few problems with your building:
-Frozen Mallet is situational. Once you get on someone you stick regardless of the slowing effect imo, unless the champs you're up against have ridiculous run speed. I prefer Aegis of the Legion, particularly in 3s where you don't get to very late game often.
-Pillager, Brutalizer and Last Whisper in the same build set: No. Stop that. I actually would only build Last Whisper if I didn't have any flat armor reduction, since they reduce each other. When S3 Black Cleaver comes out, I'd build that every time, though.
-Sunfire Cape. What is this? It doesn't provide anything Riven needs. Randuin's Omen at least gives you sticking power and a minute amount of CDR.
My favorite 3s Riven build:
Tabi/Treads, Aegis, LVDP, Sanguine Blade, BotRK (will be amazing in S3, but for now, a situational item for getting onto people) or Randuin's Omen, and Maw of Malmortius.
Once S3 hits, Black Cleaver is a must.
Edit: Also, in lane, I like to max W first, as it lets you harass without penalty constantly and gives you immense sticking power. I max E next, then Q; I mostly use Q for the passive procs. This is why I build more AD than defensive.