Slow resist

 Slow resist (or Slow resistance) is an unofficial champion statistic that reduces the strength of percentage slows. It stacks multiplicatively and can be obtained from champion abilities, items, and runes. It applies to already active slows and affects percentage self-slows (e.g. Defensive Ball Curl, Overdrive, Piercing Arrow).

It should not be confused with Tenacity, which only affects the duration of slows.

Increasing Slow Resist

Items

• Boots of Swiftness
• Silvermere Dawn
• Sunfire Aegis ( Forgefire Crest)

Champion abilities

• Urgot's Purge
• Kayn (as Shadow Assassin)'s Shadow Step (equals total resistance)

Runes

• Phase Rush
• Unflinching

Slow Immunity

Slow immunity is different from 100% slow resist as it prevents slows from being applied in the first place. It prevents the slow from drowsy but does not prevent sleep.

Note that if the slow has a cripple within the same status effect, such as Wither, cleanses that remove slows will also remove the accompanying cripple.

Champion abilities

• Master Yi's Highlander
• Sejuani's Fury of the North
• Nunu's Biggest Snowball Ever!

Statuses

• All effects that grant total crowd control immunity also prevent slows from being applied.

Cripple Immunity

Cripple immunity prevents cripples from being applied.

Champion abilities

• Master Yi's Highlander
• Sejuani's Fury of the North

Statuses

• All effects that grant total crowd control immunity also prevent cripples from being applied.

Formulas

These formulas can calculate how much slow resist you have, based on your movement speed and on the slow applied to you.

• Slow Resist is the amount of slow resist you currently have.
• Final MS is your movement speed after being slowed, already considering your slow resist.
• BaseMS is your base movement speed.
• BonusMS is the sum of all additive flat movement speed bonuses.
• MS Multiplier is the sum of all additive percent movement speed bonuses.
• Slow is the strongest slow currently applied on your champion.
• Slow Resist, MS Multiplier, and Slow are percentages (e.g. 50% is 0.5 in the formula).

Formula one:

$\pagecolor {black}\color {White}Movement\ Speed\leq 220:$ $\pagecolor {black}\color {White}SlowResist=1-({{1-{{FinalMS-110} \over {(BaseMS+BonusMS)\times (1+MSMultiplier)\times 0.5}}})\div {Slow}}$

Formula two:

$\pagecolor {black}\color {White}220\leq Movement\ Speed\leq 415:$ $\pagecolor {black}\color {White}SlowResist=1-({{1-{{FinalMS} \over {(BaseMS+BonusMS)\times (1+MSMultiplier)}}})\div {Slow}}$

Formula three:

$\pagecolor {black}\color {White}415\leq Movement\ Speed\leq 490:$ $\pagecolor {black}\color {White}SlowResist=1-({{1-{{{{FinalMS-475} \over {0.5}}+490} \over {(BaseMS+BonusMS)\times (1+MSMultiplier)}}})\div {Slow}}$

Formula four:

$\pagecolor {black}\color {White}Movement\ Speed\geq 490:$ $\pagecolor {black}\color {White}SlowResist=1-({{1-{{{{FinalMS-415} \over {0.8}}+415} \over {(BaseMS+BonusMS)\times (1+MSMultiplier)}}})\div {Slow}}$

Notes

• Slow resist does not affect abilities that reduce the target's movement speed by / to a flat amount (e.g. Jack in the Box, Shield of Durand, Whimsy).
• A champion with Boots of Swiftness, a movement speed of 400 and who is affected by a 40% slow will have a movement speed of 400 × (1 − (0.4 × 0.75)) = 280, which is equal to a 30% slow without slow resist.

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Last updated: May 15, 2020, patch V10.10

• The highest amount of  slow resist obtainable is 100% with Shadow Assassin Kayn.

• The highest amount obtainable below 100% is 92.35% with Urgot.
  • Purge
  • Boots of Swiftness
  • Phase Rush
  • Unflinching

Relevant mathematics

1 - ((1 - 0.4) × (1 - 0.25) × (1 - 0.75) × (1 - 0.2) × (1 - 0.15)) = 92.35%

Patch History

V10.4

• Now stacks multiplicatively instead of additively. Can no longer go above 100% slow resist, thus increasing movement speed with slows.

V1.0.0.145 added

Champion statistics