Types of Crowd Control/Summary

Crowd Control	Movement	Attacking	Abilities	Interrupt	Spells	Affected by Tenacity	Removal
Airborne	Blocked	Blocked	Blocked	Yes		No	with dash or blink
Blind	Allowed	Parried	Allowed	No	Allowed	Yes
Cripple	Allowed	Reduced	Allowed	No	Allowed	Yes
Disarm	Allowed	Blocked	Allowed	See notes	Allowed	Yes
Charm / Flee / Taunt Forced Action	Blocked	Blocked	Blocked	Yes		Yes
Ground	Partial	Allowed	Partial	See notes		Yes
Nearsight	Allowed	Partial	Partial	See notes	Allowed	No
Root	Blocked	Allowed	Allowed	See notes		Yes
Silence	Allowed	Allowed	Blocked	Yes		Yes
Drowsy	Reduced	Allowed	Allowed	No	Allowed	No
Sleep	Blocked	Blocked	Blocked	Yes		Yes
Slow	Reduced	Allowed	Allowed	No	Allowed	Yes
Stasis	Blocked	Blocked	Blocked	Yes	Blocked	No	None
Stun and Suspension	Blocked	Blocked	Blocked	Yes		Yes
Suppression	Blocked	Blocked	Blocked	Yes	Blocked	No

Notes

• Movement includes basic movement and mobility abilities (i.e. dashes and blinks, such as Ezreal's Arcane Shift or Shen's Shadow Dash).
  • Ground does not impede basic movement, but existing sources will also apply a slow.
• Attack refers to a champion's basic attacks (by default right-click).
• Ability refers to a champion's castable spells (by default , , , and ).
• Spells refer to summoner spells.
• Interrupt refers to whether or not the effect will cancel channeled and charged abilities.
  • Roots and Grounding will only interrupt movement channels, unless otherwise stated.
• Removal refers to cleansing effects that can dispel the crowd control debuff.
• Airborne, Knockdown, and Stasis are the only crowd control effects that interrupt  dashes and displacements.
• Crowd control applied by one's self or an ally cannot be countered in any way (neither reduced, resisted, nor removed), with the exception of self slows (e.g, Pyke's Bone Skewer, Rammus' Defensive Ball Curl, Galio's Shield of Durand) which are reduced by slow resist.
• Brittle is a debuff uniquely applied by Ornn. It reduces a unit's effective Tenacity by 30% and increases the duration of Airborne effects by that percentage. It is consumed by immobilizes.
• Forced Action crowd control effects end prematurely if the Source is killed.
• All crowd control effects that inhibit attacking also interrupt attack windups. In terms of crowd control, unstoppable basic attacks are interrupted by polymorph only.
• All crowd control effects that inhibit casting will disable abilities that can be recast, unless otherwise stated by the ability.
• Spell shield blocks all components of an ability including crowd control, unless otherwise stated.
• Anivia's Glacial Storm is special cased to be deactivated by all forms of crowd control that would usually interrupt channels.
• The following mobility spells are special to be interrupted by crowd control:
  • Yasuo's Sweeping Blade is knocked down from immobilization.
  • Rakan's Grand Entrance and Battle Dance are knocked down from immobilization.
  • Gnar's Hop bounce is prevented from immobilization.
  • Ziggs' Satchel Charge's explosion does not cause him to fly from immobilization or grounding.
  • Shadow Assassin's Shadow Step's buff is lost immediately from immobilization or polymorph.
• Taunt is the only crowd control that could theoretically break stealth as the status effect is interrupted by declaring attacks.