Tenacity (or Crowd Control Reduction) is a stat that reduces the duration of all crowd control effects except Suppression icon suppression, Stasis icon stasis, and Airborne icon displacements. Tenacity can be increased with champion abilities, items, runes, and summoner spells. The duration of the crowd control is calculated the moment it's applied. It will not change if the target increases/decreases his Tenacity after the effect has been applied. Tenacity can stack both multiplicatively and additively, depending on the combination of the effects.

Increasing tenacity

The following game elements increase tenacity:



Champion abilities

  • Dr. MundoSquare Dr. Mundo's Burning Agony Burning Agony grants him 10 / 15 / 20 / 25 / 30% tenacity while toggled on.
  • GarenSquare Garen's Courage Courage grants him 60% tenacity for the first 0.75 seconds.
  • IreliaSquare Irelia's Ionian Fervor Ionian Fervor grants her tenacity based on if she is outnumbered or not. If she has the number's advantage she gains 0% tenacity, if it is an even fight she gains 10% tenacity, and if she's outnumbered she gains 25 / 30 / 35 / 40% tenacity.


Summoner Spells

Game Modes


These are the combinations that stack additively:

All the other combinations stack multiplicatively.

Reducing Tenacity

OrnnSquare Ornn's Bellows Breath Bellows Breath and Call of the Forge God Call of the Forge God apply Brittle icon Brittle to an enemy. Enemies can have up to 2 marks of Brittle icon Brittle. Each mark reduces the target's tenacity by 30%, in other words, it increases the duration of incoming Crowd Control by 30% (including Airborne icon Airborne effects).


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) = 99.081%
  • With this amount of tenacity, the longest crowd control in the game NasusSquare Nasus' Wither Wither, which usually lasts 5 seconds, will only last 0.046 seconds.
    • In comparison, a champion targeted by NasusSquare Nasus' Wither Wither, with 2 Brittle stacks (-60% tenacity), will be slowed for 8 seconds.
  • 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%.