Tenacity

 Tenacity, or Crowd Control Reduction, is a stat that reduces the duration of all incoming crowd control status effects (disables) except airborne, drowsy, nearsight, stasis, and suppression.

Tenacity is a percentage, and it indicates by how much the disable's duration is reduced. Any disable's duration cannot be reduced below 0.3 seconds*. The disable's duration is calculated at the moment of application, and does not change during it if tenacity changes.

• Tenacity stacks either multiplicatively or additively, depending on the combination of the effects.

Tenacity can be increased (self- or ally-sourced) and decreased (enemy-sourced) from abilities, buffs, items, runes, and summoner spells.

Increasing tenacity

Items

This table is automatically generated based on the data from Module:ItemData/data.

Item	Cost	Amount	Availability
Mercury's Treads Mercury's Treads	1100	30%	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Sterak's Gage Sterak's Gage	3000	20%	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid
Wit's End Wit's End	2800	20%	Nexus Blitz, Arena, Classic Summoner's Rift 5v5, All Random All Mid

Consumables

• Elixir of Iron

Champion abilities

• Garen's Courage
• Milio's Breath of Life

Runes

• Legend: Tenacity
• Tenacity and slow resist rune shard

Summoner Spells

• Cleanse

Neutral Buffs

• Chemtech Blight

Game Modes

• ARAM (Champion-specific)
• Ultra Rapid Fire
• Ultimate Spellbook

Decreasing tenacity

Note that tenacity can have negative values, which will cause incoming disables to last longer.

Champion Abilities

• Ornn's Bellows Breath and Call of the Forge God apply Brittle, a unique status effect that reduces targets' tenacity by 30%.

Items

• Anathema's Chains reduces the Nemesis' tenacity by 20% while at maximum stacks of Vendetta. This stacks additively with Brittle for a total of -50% tenacity.

Stacking

The tenacity stat is built up from sub-stats that internally are referred to as "modifiers". These are referred to as groups, from A to C. Combination of effects in the same type will stack multiplicatively, while combination of multiple types will stack additively.

Tenacity is capped at 100%.

The mathematics regarding the total tenacity is as follows:

(1 - ((1 - A1)(1 - A2)(1 - ...))) + (1 - ((1 - B1)(1 - B2)(1 - ...))) + (1 - ((1 - C1)(1 - C2)(1 - ...)))

	Source
Group A	Anathema's Chains (debuff) Elixir of Iron Mercury's Treads Sterak's Gage Wit's End Legend: Tenacity Tenacity and slow resist rune shard Chemtech Blight
Group B	Milio's Breath of Life Cleanse ARAM's champion-specific balance modifier Ultimate Spellbook's innate buff Ultra Rapid Fire's innate buff
Group C	Garen's Courage Brittle Rift Scuttler's innate negative tenacity

For instance, a champion owns Mercury's Treads and has Legend: Tenacity at maximum stacks, and a nearby enemy champion affects them with Brittle's tenacity reduction. The sum of their tenacity is calculated as follows:

• Group A Tenacity modifiers = 30% ×  20%
• Group C Tenacity modifier = -30%
• Final Tenacity = (1 - ((1 - ) × (1 - )) Group A Tenacity modifiers + Group C Tenacity modifier
• = (1 - ((1 - 0.3) × (1 - 0.2)) + -0.3
• = (1 - (0.7 × 0.8)) + -0.3
• = 0.44 + -0.3 = 14%

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, Eleisa's Miracle and Moonflair Spellblade (all later removed). 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.
• Prior to the Preseason of 2021, a website news post was made that announced that Tenacity would reduce the duration of knockups. However, the change was confirmed to have been cancelled.
• Prior to his VGU in patch V11.12, Dr. Mundo's Burning Agony granted himself 30% Tenacity which was additive with other "Champion Tenacity" buffs such as Brittle.
• Prior to V3.04, Singed's Insanity Potion granted himself 10 / 15 / 20% Tenacity.
• Prior to patch V12.22, Sunfire Aegis' Mythic passive granted 5% Tenacity per Legendary item which was additive with other "Buff Tenacity" buffs such as Elixir of Iron and Unflinching.
• On patch V12.22 it became possible to reach 100% tenacity by combining Mercury's Treads (30%) Silvermere Dawn (active) (50%) and Iceborn Gauntlet with 4 other legendary items (20%), which are additive with one another. Until V12.23 it was even possible to reach 120% Tenacity by including Mosstomper Seedling, which was also additive with these sources.
• After V13.3, the highest amount of tenacity was changed to 100% since combinations of effects in different groups were made to be additive.
  • Examples of combinations that can reach the cap (V13.18):
    • Courage and Cleanse [60% + 50% = 110%]
    • Courage, Mercury's Treads and Legend: Tenacity [60% + (1 - 0,7 * 0,8) = 104%]
    • Mercury's Treads, Breath of Life and Cleanse [30% + (1 - 0,35 * 0,5) = 112,5%]
    • Cleanse, Mercury's Treads and Sterak's Gage [50% + (1 - 0,7 * 0,7) = 101%]

Champion statistics