Channeling an ability causes the caster to stop acting for the duration of the spell. Channeled spells may be ended when the channeling unit takes another action or is interrupted by another spell. While spells are being channeled, a draining bar will appear on the screen, indicating how much time is left in the channel.
Interrupting channeled abilities
If the channeling unit is issued another command, such as to move, stop, or attack, the unit will disrupt the channeled ability. Casting other spells or using items will also interrupt channeling, with the exception of toggled abilities, Wind Walk abilities, a few other abilities like Blade Fury, and the items below.
The only items that may be activated while channeling are Armlet of Mordiggian, Glimmer Cape, Mask of Madness, Observer and Sentry Wards (switching only), Phase Boots, Radiance, Ring of Aquila, Ring of Basilius, Shadow Amulet, Shadow Blade, Shiva's Guard and Silver Edge. Activating any other item, including Power Treads, Drum of Endurance or consumables will interrupt channeling.
Any disable that would normally prevent a unit from casting the spell in question will also interrupt channeling. This includes Stuns, Mini-stuns, Cyclones, Hexes, Sleeps and getting hidden. Though they do not prevent casting, most Root effects will also interrupt channeling. Silence will interrupt channeling from abilities only, while Doom and Static Storm (with Aghanim's Scepter) will interrupt channeling from items as well. Some spells that forcibly move units, such as Vacuum or X Marks the Spot (the first applies a ministun while moving units, and the second one is like an uncontrollable blink), will interrupt channeling as well, even if used on friendly units, however, other spells like Force Staff and Boulder Smash, will not interrupt channeling, because they just give a little push to their targets.
If the channel is interrupted before the spell's effects occur, the mana and cooldown will be wasted, and the spell's effect will be cut short, and in some cases will not perform their effects at all. This is in contrast to other, non-channeled spells with high cast times, such as Assassinate and Requiem of Souls, which will not expend mana or go on cooldown until the spell has been completed. Certain channeled spells, such as Illuminate and Powershot, will still perform their effect even if they are cancelled, usually at the cost of damage.
- Max Channel Time: 5
Disables, damages, and drains mana from a single target.
- Max Channel Time: 10
Damages and slows nearby enemy units.
- Channel Time: 1.3
At the end of the duration, sleeps and deals damage to nearby enemy units.
- Max Channel Time: 4
Damages, disables, and sucks in enemy units in an area.
- Max Channel Time: 2/3/4/5
When the channel ends or is cancelled, releases a wave that deals damage based on how long it was channeled.
- Max Channel Time: 5
Drains mana from a single target.
- Max Channel Time: 1.6
When the channel ends or is cancelled, Monkey King jumps towardst he target area and deals damage and slows based on the time spent channeling.
- Max Channel Time: 0.75/1.5/2.25/3.25
Renders the caster invulnerable and untargetable for the duration.
- Max Channel Time: 10
Drains health from a single target.
- Max Channel Time: 3/4/5
Renders the caster invulnerable and untargetable for the duration and causes it to attack all enemy heroes within range every second.
- Channel Time: 2
At the end of the duration, slows and deals damage to nearby enemy units for 3 seconds.
- Max Channel Time: 50
Turns the caster invisible and deals damage to nearby enemy units.
- Max Channel Time: 2.75/3.5/4.25/5
Disables and deals damage to a single target.
- Channel Time: 3/1.5/0.75
At the end of the duration, refreshes the caster's cooldowns.
- Max Channel Time: 16
Slows enemy units in an area.
- Max Channel Time: 40
Creates a controllable Tornado that slows and deals damage to nearby enemy units.
- Max Channel Time: 1
When the channel ends or is cancelled, deals damage and destroys trees in a line. If it is cancelled early, the damage will be greatly reduced.
- Max Channel Time: 8
Creates a Death Ward that attacks nearby enemy heroes.
- Channel Time: 3
Teleports the caster to a friendly non-hero unit (/hero when upgraded) at the end of the duration.
- First Channel Time: 3
Second Channel Time: 5
Following Channel Time Increase: 0.5
Teleports the caster to a friendly building at the end of the duration.