Slow resist (or Slow resistance) is a stat that unlike tenacity, which reduces the duration of crowd control effects (including slows), reduces the strength of Slow icon slows and self-Slow icon slows. Slow resist can be obtained through champion abilities, items, and runes, and stacks additively.

Unlike tenacity, slow resist also applies to already active slows.

Increasing Slow Resist

Items

Champion abilities

Runes

Slow Immunity

Slow immunity is different from 100% slow resist as it will remove any Slow icon slows or Cripple icon cripples as they are applied.

Champion abilities

Items

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}} $

Trivia

  • Example of slow resist effect: A champion with Boots of Swiftness item 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: December 6, 2017, patch V7.24

Purge 40% + Boots of Swiftness item 25% + Phase Rush rune 75% + Unflinching rune 15% = 155%
  • With this amount of slow resist, slows will no longer slow you. They will however increase your movement speed by (slow% × 55)%, stacking multiplicatively with Phase Rush rune Phase Rush's bonus.
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