Slow resist

 Slow resist (or Slow resistance) is an unofficial champion statistic that reduces the strength of  slows. It  stacks multiplicatively and can be obtained from champion abilities, items, and runes. It applies to already active slows. It affects self-slows (e.g, Defensive Ball Curl, Overdrive, Piercing Arrow). It should not be confused with  Tenacity, which only reduces the duration of slows.

Increasing Slow Resist

Items

• Boots of Swiftness

Champion abilities

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

Runes

• Phase Rush
• Unflinching

 Slow Immunity

See also: Crowd_control#Immunity

Slow immunity is different from 100% slow resist as it prevents  slows from being applied in the first place, and in most cases  cripples too. It removes the slow from  drowsy but does not prevent  sleep.

Note that if the slow has a cripple within the same status effect (i.e - Nasus' Wither),  cleanses that remove slows will also remove the cripple.

Champion abilities

• Master Yi's Highlander cleanses and provides immunity to slows and cripples for the buff's duration.
• Sejuani's Fury of the North provides immunity to slows and cripples while active.
• Nunu's Biggest Snowball Ever! cleanses and provides immunity to slows while channeling.

Statuses

• All spells that grant  total crowd control immunity also prevent slows and cripples from being applied.

Items

• Mikael's Crucible  cleanses crowd control, then provides immunity to slows only for 2 seconds.

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} Slow Resist = 1 - ({{1 - {{FinalMS - 110} \over {(BaseMS + BonusMS) \times (1 + MS Multiplier) \times 0.5}}}) \div {Slow}} $

Formula two:

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

Formula three:

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

Formula four:

$ \pagecolor{black}\color{White} Movement\ Speed \geq 490: $ $ \pagecolor{black}\color{White} Slow Resist = 1 - ({{1 - {{{{FinalMS - 415} \over {0.8}} + 415} \over {(BaseMS + BonusMS) \times (1 + MS Multiplier)}}}) \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.

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

Champion statistics

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