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A channeled ability is an ability that can be interrupted by crowd control effects that inhibit casting (in addition to Death). These effects are: Airborne icon airborne, Charm iconFlee iconTaunt icon forced action, Disarm icon disarm, Silence icon silence, Stasis icon stasis, Stun icon stun and Suppression icon suppression. When the caster activates the channelled ability he stops any action he was performing at that moment.

While the effects of the ability are present the caster is channelling the ability. In most cases the caster can stop the channelling by performing any action, such as autoattacking, moving or casting their other abilities. Some channelled abilities, however, prevent the caster from doing anything else until the channeling finishes. Most activatable items and summoner spells can be used while channeling without interrupting.

Interrupting Channels

Interrupting Channels

List of Channeled Abilities

Champion Ability Channel duration Notes
Caitlyn OriginalSquare Caitlyn Ace in the Hole Ace in the Hole 1 seconds Channeling for the full duration is required to fire the missile. If the target dies while channeling, the ability is put on a 5-second cooldown.
Fiddlesticks OriginalSquare Fiddlesticks Drain Drain 5 seconds Deals damage every 0.5 seconds while channeling.
Crowstorm Crowstorm 1.5 seconds Channeling for the full duration is required to blink and start dealing damage.
Gragas OriginalSquare Gragas Drunken Rage Drunken Rage 0.75 seconds Channeling for the full duration is required to gain the bonus magic damage for Gragas' next basic attack within ~5 seconds. Gragas also gains damage reduction for 3 seconds.
Janna OriginalSquare Janna Monsoon Monsoon 3 seconds Health is restored every 0.5 second while channeling.
Karthus OriginalSquare Karthus Requiem Requiem 3 seconds Channeling for the full duration is required to deal the damage. While Death Defied Death Defied is active, it is impossible to interrupt Requiem.
Katarina OriginalSquare Katarina Death Lotus Death Lotus 2.5 seconds Damage is dealt every 0.166 seconds while channeling.
Malzahar OriginalSquare Malzahar Nether Grasp Nether Grasp 2.5 seconds Damage is dealt to enemies in the Null Zone that is created upon starting the channel every second; interrupting the channel won't make the Null Zone disappear prematurely.
Master Yi OriginalSquare Master Yi Meditate Meditate 4 seconds Health is restored every 0.5 second while channeling.
Miss Fortune OriginalSquare Miss Fortune Bullet Time Bullet Time 3 seconds Damage is dealt every 0.25 / 0.2142 / 0.1875 second while channeling.
Nunu OriginalSquare Nunu Absolute Zero Absolute Zero 3 seconds Damage will be dealt even if the channeling is interrupted, but the damage will be reduced.
Ornn OriginalSquare Ornn Living Forge & Master Craftsman Living Forge 4 seconds Channeling for the full duration is required to purchase item.
Pantheon OriginalSquare Pantheon Aegis Assault Aegis Assault 1.5 seconds Damage is dealt every 0.5 second while channeling.
Grand Starfall Grand Starfall 2 seconds Channeling for the full duration is required to teleport and deal the damage.
Twisted Fate OriginalSquare Twisted Fate Gate Gate 1.5 seconds Channeling for the full duration is required to teleport.
Warwick OriginalSquare Warwick Infinite Duress Infinite Duress 1.5 seconds Damage is dealt every 0.3 second while channeling. The suppress effect ends early upon the channel being interrupted.
Rammus OriginalSquare Rammus Powerball Powerball 6 seconds Gains movespeed while channeling. Upon collision deals damage and knocks back enemies. Enemies are then slowed for 1 second.

Movement Channels

The following abilities can also be interrupted by any form of crowd control that interrupts movement, namely: Root icon root and Root iconDisarm icon entangle, in addition to all those listed above.

Champion abilities
Champion Ability Channel duration Notes
Caitlyn OriginalSquare Caitlyn 90 Caliber Net 90 Caliber Net ~0.25 seconds Channeling for the full duration is required to dash.
Shen OriginalSquare Shen Stand United Stand United 3 seconds Channeling for the full duration is required to teleport.
Zac OriginalSquare Zac Elastic Slingshot Elastic Slingshot 0-Unknown seconds The range increases over the first 0.9 / 1 / 1.1 / 1.2 / 1.3 seconds. The cooldown is reduced by half the base amount and half the health cost is refunded if the ability is canceled, interrupted or times out.
Other
Name Duration of channel Notes
Teleport Teleport 4 seconds Channeling for the full duration is required to teleport.

Objective Channels

The following abilities can also be interrupted by taking damage (this does not include health costs). As of V4.4, shielded champions will still be interrupted even if the damage is mitigated.

Name Duration

of channel

Notes
Empowered Recall Empowered Recall 4 seconds Channeling for the full duration is required to teleport.
Recall Recall 8 seconds Channeling for the full duration is required to teleport.
Greater Relic 3 seconds Channeling for the full duration is required to capture the objective.
Capture point Varying duration Channeling for the full duration is required to capture the objective. If the capture point is owned by the enemy, it will neutralize halfway through the channel.

Attacking Channel

Unlike other forms of channeling, Lucian OriginalSquare Lucian's The Culling The Culling can be interrupted by attack-inhibiting crowd control effects rather than casting-inhibiting effects. These effects are: Airborne icon airborne, Root iconDisarm icon entangle, Charm iconFlee iconTaunt icon forced action, Disarm icon disarm, Stun icon stun and Suppression icon suppression. The difference in the list is that Silence icon silence is not present and Root iconDisarm icon entangle is. This is the only case of an attacking channel that does not inhibit movement.

Champion Ability Channel duration Notes
Lucian OriginalSquare Lucian The Culling The Culling 0–2 seconds Damage is dealt over the duration depending on the ability's rank.

Unstoppable Channel

The following ability can only be interrupted through Death:

Uniquely, Unstoppable Onslaught Unstoppable Onslaught's is a channeled spell which additionally grants him a buff preventing CC from being applied to Sion. And even though the cast of Unstoppable Onslaught Unstoppable Onslaught does not cleanse current crowd control, Sion can already not cast the spell when he is affected by the types of crowd control that would interrupt a channel (not unlike all other channeled abilities). Thus the channel cannot usually be interrupted.

There are a few exceptions, however:

  • Sion can still be interrupted by death, as with all other channels. If so, the effect will end as if he collided with a champion or wall, by dealing the AoE damage and CC effect around his current location immediately.
  • Due to a bug with Roar of the Slayer Roar of the Slayer, Sion can occasionally cast his ultimate despite being Root icon snared. In that case, he will stand in place until the snare status effect wears off (In this time, the damage, stun duration and movement speed granted by the ability will still ramp up, and an enemy coming in contact with Sion will have them collide as normal).
  • The same bug allows Sion to cast his ultimate during most other hard CC aswell. If Sion starts charging while Stun icon stunned, Airborne icon knocked up or Silence icon silenced for example, the channel will be interrupted almost immediately, and Sion will perform the same leap as he does when the channel ends at maximum duraction (8s) or is ended normally via its second cast.
  • An allied trigger of the Blast Cone does not count as enemy CC and will thus disregard Sion's CC immunity, interrupting his ultimate. Sion will be turned in the direction in which he would be knocked into, then initiate the leap as if he has recasted the ultimate or was affected by enemy hard CC (see paragraph above), overriding the initial airborne effect of the plant.

Because Unstoppable Onslaught Unstoppable Onslaught is a channeled spell, Kalista OriginalSquare Kalista's Fate's Call Fate's Call will wait with its effect until the channel has ended, dragging Sion back to her across a potentially massive distance. Even though Sion will be dragged immediately after the channel ends, as he is still leaping if he didn't collide with anything, the AoE damage and CC effect still happen in the usual place of his would-be landing spot.

Champion Ability Channel duration Notes
Sion OriginalSquare Sion Unstoppable Onslaught Unstoppable Onslaught 0–8 seconds Damage and CC duration increase over the first 3 seconds of channeling. Not usually interruptable except through death, which has the same result as colliding with a champion or wall.

Charged Abilities

With the release of Varus OriginalSquare Varus, a new subtype of channeling was added to the game - charging. A charged ability has two activations - the first begins the charging and the second will fire the ability. While using quick cast, the player must keep the hotkey held down to charge the ability and it will fire upon releasing the key. For most charged abilities, the caster is still able to move freely including the use of Flash Flash and Dark Passage Dark Passage.

Charging is a sub-classification. The forms of crowd control that will interrupt a charged ability depends on the ability's supertype.

Champion Ability Channel duration/type Notes
Pantheon OriginalSquare Pantheon Comet Spear Comet Spear 0–4 seconds; classic channel The damage is modified after the first 0.5 seconds, the range is capped after 1 second. Mana is half refunded if it times out, or is interrupted.
Pyke OriginalSquare Pyke Bone Skewer Bone Skewer 0–2 seconds; classic channel The range and crowd control is modified after the first 05 seconds. Mana is half refunded if it times out, or is interrupted.
Sion OriginalSquare Sion Decimating Smash Decimating Smash 0–2 seconds; classic channel Sion is unable to issue movement commands while charging. The damage and range increases over the duration, the crowd control changes passing the first second, and said new crowd control increases its duration over the last second. The cooldown is reduced to 2 seconds if the ability is interrupted.
Varus OriginalSquare Varus Piercing Arrow Piercing Arrow 0–4 seconds; classic channel The damage and range increase over the first 2 seconds. Mana is refunded if Varus cancels the shot or it times out.
Vi OriginalSquare Vi Vault Breaker Vault Breaker 0–4 seconds; movement channel The damage and range increase over the first 1.25 seconds. The cooldown is reduced to 3 seconds and mana is refunded if the ability is interrupted.
Xerath OriginalSquare Xerath Arcanopulse Arcanopulse 0–3 seconds; classic channel The range increases over the first 1.5 seconds. Half the mana cost is refunded if the ability times out.

Casting Times

Most champion abilities that are cast (like Disintegrate Disintegrate) have a very brief casting time that will interrupt other actions, such as movement or attacking (most will automatically have the champion continue in their previous actions, although some will interrupt previous actions indefinitely). These casting times cannot be interrupted except by the caster's death. Casting times will show a channeling bar on screen, although the bars of short casting times will often not be drawn except on very high framerates.

Champions will ignore crowd control effects while casting, with the exception of Airborne icon displacement effects. This is different from crowd control immunity as the effect can persist the duration of the casting time. If a champion is knocked about while casting, the skill will still fire from the point of cast regardless of the caster's position at the time of fire (although it's worth noting that the animation will occasionally fire from the new location). For blinks and dashes, they too will move toward the selected target after the casting has finished regardless of crowd control effects suffered during the cast time.

"Casting" is sometimes referred to as "charging", although charging was assigned to a new mechanic with the release of Varus OriginalSquare Varus.

Some notable examples of longer casting times, or casting times that are frequently labelled bugs on account of their ability to ignore crowd control:

Champion Ability Cast duration Notes
Noxian Guillotine Noxian Guillotine 0.25 seconds There is a wind-down animation upon landing, however this is not forced and Darius can move instantly.
Ezreal OriginalSquare Ezreal Arcane Shift Arcane Shift 0.25 seconds There is a wind-down animation upon landing, however this is not forced and Ezreal can move instantly.
Trueshot Barrage Trueshot Barrage 1 second Casting for the full duration is required to fire
Kassadin OriginalSquare Kassadin Riftwalk Riftwalk 0.25 seconds There is a wind-down animation upon landing, however this is not forced and Kassadin can move instantly.
Lux OriginalSquare Lux Final Spark Final Spark 0.5 seconds Casting for the full duration is required to fire
Neeko OriginalSquare Neeko Pop Blossom Pop Blossom 1.25 seconds Casting for the full duration is required to fire. Does not interrupt any actions.
Tristana OriginalSquare Tristana Rocket Jump Rocket Jump 0.25 seconds Tristana cannot move or attack during the animation, but may use her abilities
Urgot OriginalSquare Urgot Fear Beyond Death 2 Fear Beyond Death (second cast) 1.5 seconds Urgot can freely move while pulling but not while reeling the target. The channel can only be interrupted by Urgot's death.
Flashy Cast Times

Flashy Cast Times

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