Top augment choices for Riven include Shadow Runner (Silver), Outlaw's Grit (Gold), Dashing (Prismatic).
Overall
Outlaw's Grit
Outlaw's GritAfter using a Dash, Blink, or Teleport Ability you gain Armor and Magic Resist.
Tier: S+
Pick %: 40%
Dashing
DashingYour dash, leap, blink, or teleport Abilities gain @Haste@ Ability Haste.
Tier: S+
Pick %: 33%
Earthwake
EarthwakeYour dash, blink, or teleport Abilities leave behind a trail that detonates after 1 second.
Tier: S+
Pick %: 26%
Silver
Shadow Runner
Shadow RunnerAfter using a dash, leap, blink, or teleport Ability or exiting Stealth, gain @spell.Augment_ShadowRunner:MSAmount@ Move Speed for @spell.Augment_ShadowRunner:BuffDuration@ seconds.
Tier: S+
Pick %: 12%
Trailblazer
TrailblazerDashing or Blinking applies a Burn to a nearby enemy that deals damage over time, stacking infinitely.
Tier: S+
Pick %: 9%
Goredrink
GoredrinkGain @Omnivamp*100@% Omnivamp.
Tier: S+
Pick %: 7%
Gold
Outlaw's Grit
Outlaw's GritAfter using a Dash, Blink, or Teleport Ability you gain Armor and Magic Resist.
Tier: S+
Pick %: 40%
Thread the Needle
Thread the NeedleGain @PercentPen*100@% %i:scaleAPen% Armor Penetration and %i:scaleMPen% Magic Penetration.
Tier: S+
Pick %: 10%
Transmute: Prismatic
Transmute: PrismaticGain a random %i:Augment% Prismatic Augment.
Tier: S+
Pick %: 10%
Prismatic
Dashing
DashingYour dash, leap, blink, or teleport Abilities gain @Haste@ Ability Haste.
Tier: S+
Pick %: 33%
Earthwake
EarthwakeYour dash, blink, or teleport Abilities leave behind a trail that detonates after 1 second.
Tier: S+
Pick %: 26%
Jeweled Gauntlet
Jeweled GauntletYour Abilities can Critically Strike. Gain %i:scaleCrit% @CritGranted@% Crit Chance.