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Tenacity icon Tenacity (or Crowd Control Reduction) is a stat that reduces the duration of all incoming Stun icon crowd control status effects except Airborne icon airborne, Drowsy icon drowsy, Nearsight icon nearsight, Stasis icon stasis, and Suppression icon suppression. The stat is the percentage by which the duration is reduced. This reduction is limited, the duration can never drop below 0.5 seconds. The duration of the crowd control is calculated at the time of application and does not change if the tenacity changes.

Increasing tenacity

Tenacity can be increased with champion abilities, items, runes, and summoner spells, stacking either Multiple stacking icon multiplicatively or Additive stacking icon additively depending on the combination of the effects.



Champion abilities


Summoner Spells

Game Modes


These are the combinations that stack additively:

All the other combinations stack multiplicatively.

Reducing Tenacity

Tenacity can be reduced to negative values, causing crowd control to last longer.

Champion Abilities


  • Rift ScuttlerSquare Rift Scuttler has -100% tenacity, doubling the duration of crowd control effects applied to her. This stacks additively with Brittle icon Brittle for a total of -130% tenacity.


Last updated: November 20, 2019, patch V9.23

1 - ((1 - (Courage 0.6 + Unflinching rune 0.15)) × (1 - (Elixir of Iron item 0.25 + Unflinching rune 0.2)) × (1 - Legend- Tenacity rune 0.3) × (1 - (Mercury's Treads item 0.3 + Sterak's Gage item 0.3)) × (1 - Cleanse 0.65) = 
1 - (0.25 × 0.55 × 0.7 × 0.4 × 0.35) = 98.652%
  • With this amount of tenacity, Nasus OriginalSquare Nasus' Wither Wither (longest crowd control in the game) would only last 0.067 seconds. The minimum crowd control duration prevents this.
    • In comparison, Nasus OriginalSquare Nasus' Wither Wither would last 6.5 seconds if the target has no tenacity and is Brittle icon Brittled.
  • Note that this amount of tenacity can only be achieved briefly with Courage Courage wearing off almost immediately, and with Unflinching rune Unflinching and Sterak's Gage item Sterak's Gage which grant a temporary buff.
  • With the Ultra Rapid Fire buff enabled, the maximum tenacity achievable is 98.989%.
1 - (0.25 × 0.55 × 0.7 × 0.4 × 0.35 × 0.75) = 98.989%
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