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Tenacity (or Crowd Control Reduction) is a stat that reduces the duration of all incoming Stun icon crowd control effects except Suppression icon suppression, Stasis icon stasis, and Airborne icon displacements. 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 both multiplicatively and additively depending on the combination of the effects.

Items

Elixirs

Champion abilities

Runes

Summoner Spells

Game Modes

Stacking

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

Trivia


Last updated: March 7, 2018, patch V8.4

1 - ((1 - (Courage 0.6 + Unflinching rune 0.15)) × (1 - (Elixir of Iron item 0.25 + Travel Size Elixir of Iron item 0.25 + Unflinching rune 0.2)) × (1 - (Moonflair Spellblade item 0.35 + Sterak's Gage item 0.3)) × (1 - Cleanse 0.65) = 
1 - (0.25 × 0.3 × 0.35 × 0.35) = 99.081%
  • With this amount of tenacity, NasusSquare Nasus' Wither Wither (longest crowd control in the game) would only last 0.046 seconds. The minimum crowd control duration prevents this.
  • Note that this amount of tenacity can only be achieved briefly with Courage Courage wearing off almost immediately.
  • With the Ultra Rapid Fire buff enabled, the maximum tenacity achievable is 99.311%.
1 - (0.25 × 0.3 × 0.35 × 0.35 × 0.75) = 99.311%
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