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Effect Removes all disables (excluding Suppression) and summoner spells debuffs affecting your champion and grants 65% crowd control reduction for 3 seconds.
Cooldown 210 seconds
Range Self
Breaks stealth No
Level 2
Cleanse in action

Cleanse.png Cleanse is a self-targeted summoner spell. Its primary function is to remove active crowd control effects, allowing the summoner to continue pursuit or escape.


  • Cleanse will remove any and all of the following effects: blind, charm, flee, slow, polymorph, silence, root (sometimes called Entangle, Snare or Immobilize), stun and taunt.
    • Cleanse will not remove non-CC effects, such as: damage over time, attack speed reductions, defense shredding and Grievous Wounds. Quicksilver Sash item.png Quicksilver Sash is an alternative to Cleanse that will remove all of these effects.
      • However, Exhaust.png Exhaust is completely removed and Ignite.png Ignite has its true damage over time component removed.
  • Cleanse will provide 3 seconds of 65% crowd control reduction after activation. This stacks multiplicatively with other sources, such as Tenacity and champion abilities.
    • This crowd control reduction will have no effect on additional Ignite.png Ignites but will reduce the duration of movement speed slows from additional Exhaust.png Exhausts.
  • Cleanse has no effect on Suppression, knock-ups, knock-backs, grabs and flings. This is true for both the removal and reduction effects.
  • Cleanse will remove all effects contained within the crowd control debuff.


  • The tooltip previously stated that Cleanse was able to remove the Sleep debuff, though no such effect has ever existed in the game.
  • Cleanse was named Boost up until V0.9.22.15.
  • Prior to V3.13, Ground Slam.png Ground Slam and Barrel Roll.png Barrel Roll were the only attack speed slows in the game not connected to a movement speed slow and so were the only attack speed slows that Cleanse did not remove.

Patch History

  • Icon updated.


  • Fixed a bug where it could interrupt Teleport.png Teleport.


  • Now cleanses summoner spell debuffs such as Exhaust.png Exhaust's movement speed and damage reduction and Ignite.png Ignite's damage over time.
  • Cooldown increased to 210 seconds from 150 seconds.
  • Improved Cleanse no longer reduces cooldown, but now extends the secondary disable reduction buff by 1 second.


  • Removed the word "sleeps" from tooltip.



  • Now removes silence and blind effects.


  • Can now be used without breaking stealth.


  • Now only removes crowd controlling effects, silences and blinds. It no longer removes effects such as damaging debuffs or armor/stat debuffs


  • Cooldown increased to 150 seconds from 120.


V1.0.0.63: Remake

  • No longer provides debuff immunity (but still removes debuffs when cast). Provides a 50% duration reduction to stuns, slows, taunts, fears, snares, sleeps and immobilizers for the next 3 seconds.
  • Cooldown increased to 120 seconds from 100.
  • Willpower (mastery): Cooldown reduction reduced to 20 seconds from 30.


  • Now provides 2 seconds of debuff immunity after cast.


  • Cooldown reduced to 100 seconds from 120.


  • Added the summoner spell particle.
  • No longer stops Requiem.png Requiem.

V0.9.22.15: Remake

  • Renamed to Cleanse from Boost
    • Removes all debuffs from your champion, can be cast while disabled.
    • Cooldown reduced to 120 seconds from 150.


  • Cooldown increased to 150 seconds from 120.
  • Duration reduced to 12 seconds from 15.

July 10, 2009 Patch:

  • Duration reduced to 15 seconds from 30.

June 26, 2009 Patch:

  • Will Power (mastery): Increases the duration of Boost by 2 seconds, and reduces the cooldown by 30 seconds.
  • Is no longer gets consumed by autoattack abilities like Frost Shot.png Frost Shot or Toxic Shot.png Toxic Shot.

June 6, 2009 Patch:

  • Gave it the correct buff icon/tooltip.
  • Can now be cast while disabled.

May 29, 2009 Patch:

  • Tooltip fixes.

May 23, 2009 Patch:

  • Now activates a 30 second duration spell shield (90 secong cooldown), also removes any slows/silences/snares currently on the caster.

May 1, 2009 Patch:

  • Cooldown reduced to 90 seconds from 180.
  • Known issue: it doesn't break stuns, fears, or silences.

Alpha Week 5:

  • Initial cooldown reduced to 0, and cooldown reduced to 180 seconds from 480.

Alpha Week 4:

  • Cooldown reduced to 360 seconds from 480.

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