Crowd control

Every kind of crowd control, what each one stops you doing, and how tenacity and cleanse effects interact with them.

Crowd control (CC) is any effect that takes away part of a champion's control over their own actions: where they can move, whether they can attack or cast. Landing it decides most fights, and so does dodging it.

Hard and soft crowd control

Hard CC takes away movement and actions entirely or forces a movement on you. Soft CC restricts one thing and leaves the rest. A stun is hard; a slow is soft.

Types of crowd control

Effect	What it stops	Notes
Stun	Moving, attacking, casting	The plainest hard CC.
Airborne	Moving, attacking, casting	Knock-ups, knock-backs and pulls. Not shortened by tenacity.
Suppression	Moving, attacking, casting	Usually from an ultimate that channels on you. Not shortened by tenacity.
Root	Moving and dashing	You can still attack and cast in place.
Slow	Part of your move speed	Only the strongest slow on you applies.
Silence	Casting abilities	Attacks and movement still work.
Disarm	Basic attacks	Abilities and movement still work.
Blind	Basic attacks land	Attacks miss and their on-hit effects do not apply.
Grounded	Dashes and blinks	Walking still works; Flash does not.
Taunt	Your own choices	You walk at and attack the champion who taunted you.
Fear / flee	Your own choices	You walk away from the source.
Charm	Your own choices	You walk towards the source.
Sleep	Everything	Ends early when you take damage.
Polymorph	Attacking and casting	You are turned into a harmless critter and slowed.
Nearsight	Your vision	Your sight radius shrinks to a small circle.

Tenacity

Tenacity shortens the duration of crowd control on you. It comes from some boots, items, runes and abilities. Several sources combine multiplicatively, so two sources of 30% give 51%, not 60%. Airborne effects and suppression ignore it entirely.

Removing crowd control

CleanseSummoner spell

Cleanse (the summoner spell) removes the disables on you and briefly makes you resist new ones. It does not remove suppression or airborne effects.
Quicksilver item actives remove every disable including suppression, but not airborne.
Some champion abilities grant immunity to crowd control while they last; their tooltips say so.

Hard and soft crowd control

Types of crowd control

Tenacity

Removing crowd control

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