Crowd Control, or CC, is the term used to describe an ability or spell that temporarily reduces a unit's ability to fight. The term 'crowd control' comes from the ability to control the enemy team during fights, by either restricting their contributon or means to escape. In addition, the use of crowd control can aid in your own survivability: in the same way you can stopping them escaping, you can stop them following.
Types of Crowd Control
- Main article: Types of Crowd Control
The following are the current forms of crowd control that exist within the League of Legends:
- Airborne: A unit that is airborne is unable to control their movement, attack or cast abilities for the duration. The duration is also unnaffected by crowd control reduction and cannoted by removed by cleansing effects.
- Knockback: A knockback causes the target to be made airborne in a direction away from the point of cast.
- Knockup: A knockup causes the target to be made airborne on the spot.
- Pull/Grab: A pull effect causes the target to be made airborne in a direction toward the point of cast.
- Blind: A unit that is blinded will miss their auto-attacks for the duration.
- Forced Action: A unit that is under the effect of a forced action cannot control their own movement or attacks, and is unable to cast abilities.
- Charm: A unit that is charmed will attempt to move toward the source for the duration. If the source cannot be seen, a charmed unit will instead stand still.
- Fear: A unit that is feared will walk in random directions with reduced movement speed for the duration.
- Taunt: A unit that is taunted will attempt to attack the source of the taunt for the duration.
- Immobilize: A unit that is immobilized is unable to control their movement or attack for the duration.
- Pacify: A unit that is pacified cannot attack or cast abilities, and has reduced movement speed for the duration.
- Silence: A unit that is silenced cannot cast abilities for the duration.
- Slow: A unit that is slowed has reduced movement speed for the duration.
- Snare/Root: A unit that is snared is unable to control their movement for the duration.
- Stun A unit that is stunned is unable to control their movement, attack or cast abilities for the duration.
- Suppression: A unit that is suppressed is unable to control their movement, attack, cast abilities or use spells. The duration is also unaffected by crowd control reduction.
Please note the following:
- Movement includes abilities and summoner spells (such as Flash and
Ezreal's 
Arcane Shift). - Ability refers to a champion's kit (by default Q, W, E and R).
- Spell refers to the Summoner Spells.
- Cleanse is any effect that removes active crowd control, including the summoner spell by the same name.
Summary Table
Template:Mark denotes that the action is blocked
| Movement | Attacking | Abilities | Spells | Reduction | Removal | |
|---|---|---|---|---|---|---|
| Airborne | Template:Mark | Template:Mark | Template:Mark | Template:Mark | Template:Mark | |
| Blind | Template:Mark | |||||
| Forced Action | Template:Mark | Template:Mark | Template:Mark | |||
| Immobilize | Template:Mark | Template:Mark | ||||
| Pacify | Template:Mark | Template:Mark | ||||
| Silence | Template:Mark | Template:Mark | ||||
| Snare | Template:Mark | |||||
| Stun | Template:Mark | Template:Mark | Template:Mark | |||
| Suppression | Template:Mark | Template:Mark | Template:Mark | Template:Mark | Template:Mark |
- Suppression cannot be removed by the summoner spell Cleanse.
- Slow, whilst a form of crowd control, doesn't actively block anything.
- Note that movement includes abilities and spells. For example, Snare blocks Flash but not other summoner spells.
Categorization
Disruption
Crowd control is often categorized into two categories depending on whether or not the effect disrupts the channeling of an ability; abilities such as 
Karthus' 
Requiem and 
Katarina's 
Death Lotus.
Hard CC — The following effects disrupt the channeling of abilities:
- Airborne (Knockback, Knockup and Pull)
- Forced Action (Charm, Fear and Taunt)
- Pacify
- Silence
- Stun
- Suppression
Soft CC — The following effects do not disrupt the channeling of abilities:
- Blind
- Immobilize
- Slow
- Snare
Modifiers
Abilities can also be categorized by what their effects inhibit.
Movement Modifiers — The following effects in some way inhibit movement:
- Airborne (Knockback, Knockup and Pull)
- Forced Action (Charm, Fear and Taunt)
- Immobilize
- Slow
- Snare
- Stun
- Suppression
Action Modifiers — The following effects in some way inhibit the ability to attack or cast abilities:
- Airborne (Knockback, Knockup and Pull)
- Blind
- Forced Action (Charm, Fear and Taunt)
- Immobilize
- Pacify
- Silence
Quasi-CC
The following are effects are comparable to crowd control in the same way silence disrupts casters, and blind dirsupts auto-attackers:
- Attack Speed Slow: An auto-attack champion whose attack speed is slowed is doing less damage per second.
- Grievous Wound: A unit that is afflicted by grievous wound is receiving less health from healing effects, health regeneration, life steal and spell vamp.
- Shred: Shred is a term used to describe an effect that reduces an enemy's armor and/or magic resistance.
The following effects control the enemy team through human response:
- Soft-Taunt: A soft-taunt is a mechanic that makes an enemy desirable to focus. This is a core feature for a tank's design, short of an actual taunt.
- Soft-Fear: A soft-fear is a mechanic that makes an enemy undesirable to focus, or even unable to be focused. Most melee DPS champions will possess this, such as
Nocturne's Shroud of Darkness, Gangplank's Remove Scurvy and Tryndamere's Undying Rage.
Countering Crowd Control
Crowd Control can be countered in three different ways.
Preventing
Crowd control can be prevented. All forms of crowd control can be prevented, including knockback, knockup and pull effects.
- Morgana's Black Shield prevents all forms of CC for 5 seconds or until the shield is broken.
- Olaf's Ragnarok prevents all CC for 6 seconds.
- Master Yi's Highlander prevents slows for (6/9/12) seconds.
- Sivir's Spell Shield creates a magical barrier for 3 seconds which can block the next enemy spell that hits her.
- Nocturne's Shroud of Darkness creates a magical shield for 2 seconds which can block the next enemy spell that hits him.
- Banshee's Veil creates a spell shield that can block a spell once every 45 seconds.
Removing
Crowd control can be removing it after it has been applied. These effects can be actived while under the effects of the crowd controll.
All forms of crowd control can be removed except knockback, knockup and pull effects.
- Cleanse removes all CC except suppression.
- Alistar's Unbreakable Will removes all forms of CC.
- Olaf's Ragnarok removes and prevents all forms of CC.
- Gangplank's Remove Scurvy removes all forms of CC except blind.
- Malzahar's Nether Grasp will continue to do damage.
- Quicksilver Sash removes all forms of CC.
- Garen's Judgment removes all slows. It also reduces the duration of new slows by 50% for the duration of the ability.
Reducing
Champions can also reduce the duration of crowd control effects. Note: This does not reduce the potency of the effect.
Tenacity
The reduction from the Tenacity stat on items does not stack with itself and stacks multiplicatively with other types of CC duration reduction from the champion abilities.
- Mercury's Treads reduces the duration of CC by 35%.
- Cloak and Dagger reduces the duration of CC by 35%.
- Eleisa's Miracle reduces the duration of CC by 35%.
- Moonflair Spellblade reduces the duration of CC by 35%.
Champion abilities
- Dr. Mundo's Burning Agony reduces the duration of CC while active by (15/20/25/30/35)%.
- Irelia's Ionian Fervor reduces the duration of CC by (10/25/40)% for (1/2/3) nearby enemy champion(s).
- Singed's Insanity Potion reduces the duration of CC by (10/15/20)% for 25 seconds.
- Trundle's Contaminate reduces the duration of CC while active by (20/25/30/35/40)%.
Masteries
- Template:Mi reduces the duration of CC by 10%.