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Keystone

Lethal Tempo

LETHAL TEMPO
Attack speed

Stack Attack Speed and bonus range

Effect

Hitting enemy champions with basic attacks grants stacking Attack Speed, up to 6 stacks. Each stack grants 8% (melee) or 6.4% (ranged) Attack Speed for 6 seconds. At max stacks, basic attacks also fire a bolt that deals 9 – 30 (melee) or 6 – 24 (ranged) adaptive damage, increased by 1% (melee) or 0.67% (ranged) per 1% bonus Attack Speed.

Gold Equivalent

Priced at item unit costs
650Gequivalent (match average)* estimate

Attack speed makes up 83%

02505007501,000650
  • This rune
  • Other keystones
  • Flash 971

#5 of 13 keystones. Lowest: First Strike 171G; highest: Empowerment 891G

BreakdownMatch average per effect
  • Attack speed540G83%Lv1 540 → Lv15 540
  • Max-stack bolt damage110G17%Lv1 88 → Lv15 123
By LevelThe headline is the mean of levels 1–15
  • Gold eq.
  • Match average 650
  • Flash 971
Lv1Lv5Lv10Lv15
Gold eq.628646657663
Bolt Damage (Melee)91522.530
Bolt Damage (Ranged)6101520

Effect values split the description range evenly by level

Assumptions Behind This ValueTap for details
Combat only: 50%

Effects that only work in combat or under a condition are counted as active half the time. The same rule applies to every rune and spell.

Melee/ranged average

Effects that differ for melee and ranged champions use the average of the two, since no specific champion is assumed.

At most once per 8s

Effects that re-trigger on attacks are counted at most once every 8 seconds, since a single fight only allows so many procs.

Full Calculation
Attack speed540G

BasisIn-game text (captured 2026-09-23): average of 6% melee and 4.8% ranged per stack = 5.4%, 6 stacks max; only in combat, so 50%

  1. 15.4% × 33.33G × 6 stacks × 50%= 540G
Max-stack bolt damage 7.5–2588〜123G

BasisIn-game text (captured 2026-09-23): at max stacks, basic attacks fire a bolt: average of 9–30 melee and 6–20 ranged = 7.5–25. Re-triggers on attacks, so at most once per 8s; combat only, so 50%. The bonus-attack-speed scaling is a ratio and isn't counted

  1. 17.5–25 ÷ 8s interval × 5 × 50% uptime = 2.34–7.81 per 5s. 2.34–7.81 ÷ median base regen 8–19 = 29–41%. 29–41 × 3G= 88–123G
  • Total 628–663G (level 1–15)
  • Match average: mean of levels 1–15 = 650G

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