Slow resist

 Slow resist (or Slow resistance) is an unofficial champion statistic that reduces the strength of  slows. It can be obtained from champion abilities, items, and runes, and stacks multiplicatively. 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

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.

Champion abilities

• Master Yi's Highlander cleanses and provides immunity to slows and cripples for the buff's duration.
• Kayn (as Shadow Assassin)'s Shadow Step cleanses and provides immunity to slows and cripples for the buff's duration.
• Sejuani's Fury of the North provides immunity to to slows and cripples while active.
• Nunu's Biggest Snowball Ever! cleanses and provides immunity to slows only while channeling.

Statuses

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

Items

• Mikael's Crucible  cleanses all 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

Relevant mathematics

• 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: February 19, 2020, patch V10.4

• The biggest amount of  slow resist obtainable is 92.35% with Urgot.
  • Purge
  • Boots of Swiftness
  • Phase Rush
  • Unflinching

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