Top augment choices for Trundle include Deft (Silver), Lightning Strikes (Gold), Dual Wield (Prismatic).
Overall
Dual Wield
Dual WieldWhen you Attack, fire a bolt that deals @AttackReduction*100@% damage and applies your {{ Item_Keyword_OnHit }} effects at @OnHitMod*100@% effectiveness. Gain @AttackSpeed*100@% total Attack Speed.
Tier: S+
Pick %: 17%
Lightning Strikes
Lightning StrikesGain @TotalASValue*100@% total Attack Speed. At @Breakpoint1@ Attacks per second, deal additional magic damage {{ Item_Keyword_OnHit }}.
Tier: S+
Pick %: 15%
Tap Dancer
Tap DancerYour Attacks grant you @MSPerHit@ Move Speed {{ Item_Keyword_OnHit }}. Gain Attack Speed equal to @MSToASConversion*10000@% of your Move Speed.
Heavy HitterYour Attacks deal additional physical damage equal to @HealthPercent*100@% of your max Health.
Tier: S+
Pick %: 8%
Goredrink
GoredrinkGain @Omnivamp*100@% Omnivamp.
Tier: S+
Pick %: 7%
Gold
Lightning Strikes
Lightning StrikesGain @TotalASValue*100@% total Attack Speed. At @Breakpoint1@ Attacks per second, deal additional magic damage {{ Item_Keyword_OnHit }}.
Tier: S+
Pick %: 15%
Firebrand
FirebrandYour Attacks apply an infinitely stacking Burn {{ Item_Keyword_OnHit }}, dealing damage over time.
Tier: S+
Pick %: 10%
Twice Thrice
Twice ThriceEvery @ProcCadence@ attacks, your {{ Item_Keyword_OnHit }} effects trigger a second time.
Tier: S+
Pick %: 10%
Prismatic
Dual Wield
Dual WieldWhen you Attack, fire a bolt that deals @AttackReduction*100@% damage and applies your {{ Item_Keyword_OnHit }} effects at @OnHitMod*100@% effectiveness. Gain @AttackSpeed*100@% total Attack Speed.
Tier: S+
Pick %: 17%
Tap Dancer
Tap DancerYour Attacks grant you @MSPerHit@ Move Speed {{ Item_Keyword_OnHit }}. Gain Attack Speed equal to @MSToASConversion*10000@% of your Move Speed.
Tier: S+
Pick %: 14%
Symphony of War
Symphony of WarGain the Lethal Tempo and Conqueror Keystone Runes.