Gain increasing amounts of AD or AP, Adaptive over the course of the game.
Offense
+5 AD or 9 AP
Flex
+5 AD or 9 AP
Defense
+6 Armor or 8 MR (match-up)
WhyKleptomancy
Klepto on Riven synergizes well with your ability spam combos, allowing you to generate a lot of extra gold during the early laning phase.
WhyPerfect Timing
The stasis active allows you to make out-plays and survive a close tower dive to snowball your lead. It also grants you a cheaper Guardian Angel.
WhyFuture’s Market
Future's market lets you hit you item power-spikes extra early. When combined with Lethality, your mid-game damage will be incredibly high.
WhyCosmic Insight
Riven's mana-less kit means that CDR is one of her absolute most important stats. The extra bit of Summoner CDR also means more Flash and Ignite pressure.
WhyTranscendence
As a mana-less champion, Riven heavily relies on ability spam to deal damage. More CDR means more casts and more opportunities to kill.
WhyGathering Storm
The bonus AD granted from Gathering Storm makes you a late-game monster, able to one-shot any backline champions with the right opening.