Removes all disables (excluding Suppression) and summoner spells debuffs affecting your champion and grants 65% crowd control reduction for 3 seconds. Cooldown
Self Breaks stealth
is a 'non-targeted' summoner spell. Its primary function is to remove active Cleanse crowd control effects, allowing the summoner to continue pursuit or escape.
Cleanse will remove any and all of the following effects: Blind, Charm, Fear (or ), Flee Slow (that affect Movement), 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. is an alternative to Cleanse that will remove all of these effects.
However, is completely removed and Exhaust 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 but will reduce the duration of movement speed slows from additional Ignites .
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.
Previously the tool tip stated that Cleanse was able to remove the Sleep debuff, although no such effect existed in the game.
Cleanse was named Boost up until V0.9.22.15.
Prior to V3.13 and Ground Slam were the only attack speed slows in the game not connected to a movement speed slow and so are the only attack speed slows that Cleanse did not remove.
Fixed a bug where it could interrupt .
Now cleanses summoner spell debuffs such as movement speed and damage reduction and Exhaust's damage over time
Ignite's 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.
is now properly flagged as a slow + blind and can now be removed by Exhaust
now removes silence and blind effects.
can 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 seconds.
can now remove Cleanse .
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 from 100.
Willpower (mastery): Cooldown reduction reduced to 20 seconds from 30.
provides 2 seconds of debuff immunity after cast.
Cooldown reduced to 100 from 120.
Added the summoner spell particle.
No longer stops .
renamed to Boost :
Removes all debuffs from your champion, can be cast while disabled.
Cooldown reduced to 120 from 150.
Cooldown increased to 150 from 120.
Duration reduced to 12 from 15.
July 10, 2009 Patch:
duration reduced to 15 seconds from 30.
June 26, 2009 Patch:
Will Power (mastery): Increases the duration of by 2 seconds, and reduces the cooldown by 30 seconds.
Boost no longer gets consumed by autoattack abilities like Boost or Frost Shot .
June 6, 2009 Patch:
Gave it the correct buff icon/tooltip.
Can now be cast while disabled.
May 29, 2009 Patch:
May 23, 2009 Patch:
Now activates a 30 second duration spell shield (90 sec 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 3 minutes from 8.
Alpha Week 4:
cooldown decreased to 6 minutes from 8.