Tenacity (or Crowd Control Reduction) is a stat that reduces the duration of incoming 
crowd control effects by a given percent amount, except 
suppression, 
stasis, and 
displacements.
It is however hard capped to not reduce the duration lower than 0.5 seconds. The final duration is calculated at the time of application.
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
-
Elixir of Iron
- Travel Size Elixir of Iron (gained from Kleptomancy)
Champion abilities
- Dr. Mundo's Burning Agony grants him 30% tenacity while toggled on.
- Garen's Courage grants him 60% tenacity for the first 0.75 seconds.
Runes
Summoner Spells
- Cleanse: Removes all disables (excluding Suppression and Airborne) and summoner spells debuffs affecting your champion, as well as granting 65% Tenacity for 3 seconds. (Self range) (210 second cooldown)
Game Modes
Stacking
These are the combinations that stack additively:
- Elixir of Iron; Travel Size Elixir of Iron and Unflinching's 10%/20% bonus
- Mercury's Treads / Moonflair Spellblade / Zephyr with Sterak's Gage
- Burning Agony / Courage with Brittle and Unflinching's 15% bonus
All the other combinations stack multiplicatively.
Reducing Tenacity
Tenacity can be reduced to negative values, causing crowd control to last longer.
Champion Abilities
- Ornn's Bellows Breath and Call of the Forge God apply Brittle, a unique effect that also increases Knockup duration.
Trivia
- Until patch V1.0.0.118, Tenacity was an unnamed effect unique to Mercury's Treads. That patch promoted the effect to a champion statistic and added three new items: Cloak and Dagger (later removed), Eleisa's Miracle (later removed) and Moonflair Spellblade. Tenacity from multiple sources did not stack, similar to Enhanced Movement. In Season Three there was an item overhaul, named item effects were introduced, and Tenacity was reverted to an item effect. In V3.01, all sources of crowd control reduction were changed to say "Tenacity" and Tenacity was reintroduced as a champion statistic.
- Until Season Three, Tenacity's in-game icon was the same as the icon used for Cho'Gath's Vorpal Spikes and Baron Nashor's passive. Between the introduction of season 3 changes and V3.01, it shared the same icon as the Tenacious mastery. As of V3.01, it no longer has an icon in the buff bar.
Last updated: March 7, 2018, patch V8.4
- The biggest amount of Tenacity you can obtain is 99.08125% with Garen.
- Courage + Unflinching (+75% tenacity)
- Elixir of Iron + Travel Size Elixir of Iron + Unflinching (+70% tenacity)
- Moonflair Spellblade + Sterak's Gage (+65% tenacity)
- Cleanse (+65% tenacity)
-
- 1 - (0.25 × 0.3 × 0.35 × 0.35) = 99.081%
- With this amount of tenacity, Nasus' 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 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%
| Offensive |  Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Spell vamp ·  True damage
|
|---|---|
| Defensive |   Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
|
| Utility |  Cooldown reduction ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration
|
| Other |  Experience ·  Gold generation ·  Movement speed ·  Range
|
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