Cooldown



A cooldown is a period of wait time before a spell, ability, or item power can be used again.

Mechanics
Usually, an ability will be on cooldown if the ability was activated and the cast time of the ability has passed. If the hero is interrupted before the channel time is over, the ability does nothing, and the cooldown and mana is wasted. On the other hand, abilities like and  have long cast times, and they will not go on cooldown before the cast time is over. is an exception to the usual rule; it goes on cooldown once the charge ends or is canceled, not upon cast.

If a hero has several versions of the same item, all versions will be on cooldown upon activating one of them. For instance, all are in the same cooldown group.

Some abilities or items have multiple cooldowns, using a different cooldown duration if their conditions are met. For instance, 's cooldown is 0, but only when successfully killing a hero.

Many abilities have reduced cooldown when leveled up. If an ability is on cooldown and it is leveled up, the current wait time will not be affected at all.

Some abilities have charges and a charge replenish time instead of the usual cooldown. For instance, has   charges and a  second replenish time for each charge.

Sources of Reduction
Some abilities and items are able to manipulate the cooldowns of abilities. There are several different types of cooldown manipulation sources:

The total or final cooldown of an ability is defined as

CD = (Base CD - Σ Flat Reductions) × % CD Reductions Multiplier - Σ Current CDR

Flat Reduction
These cooldown modifiers changes the cooldowns by flat amounts. Unlike percentage-based cooldown modifiers, these can affect abilities that are already on cooldown. Flat changes are applied before percentage-based changes.

Multiple sources of flat cooldown reductions stack additively.

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Talents
The following heroes have talents which reduce cooldowns of specific abilities by a flat amount.

Aghanim's Scepter Upgrade
The following heroes have upgrades which reduce cooldowns of specific abilities by a flat amount.

Aghanim's Shard Upgrade
The following heroes have upgrades which reduce cooldowns of specific abilities by a flat amount.

Current Cooldown Reduction
These cooldown modifiers changes the current cooldowns by flat amounts and affects abilities that are already on cooldown. Current flat cooldown changes are applied after percentage-based changes.

Multiple sources of current flat cooldown reductions stack additively.

Percentage-based
These cooldown modifiers reduce or increase the cooldowns of all abilities and items by a percentage when used. They cause abilities and items to enter a reduced or increased cooldown after being acquired. This means they do not retroactively affect already running cooldowns.

Percentage-based cooldown reduction sources reduces all cooldowns, including all items, passives and charge replenish times.

Multiple percentage-based cooldown reductions stack multiplicatively, and its multiplier is defined as

%CD Reduction Multiplier = 1 - $$\prod_{i=1}^n$$(1 - ri )

Unique Percentage-based Sources
The following abilities provide cooldown reduction on certain conditions.

Examples

 * What will be the cooldown of a Level 1 if  has, affected by  and has a  talent specific 20 seconds ability bonus cooldown reduction?
 * Level 1 cooldown:
 * cooldown reduction:
 * cooldown reduction:
 * Talent specific flat cooldown: 20


 * Percentage-based Cooldown Reduction Multiplier
 * = (1 - ) × (1 - )


 * Final Ability Cooldown
 * = ( - 20) ×


 * 's Level 1 ability cooldown will be at  seconds in this example.

Sources of Resetting
Some abilities are able to completely reset the cooldowns of abilities and items instantly, so that they are ready to use again.

For, the following items do not have their cooldowns reset: ,, , , , , , , , , and Neutral Items.

Unaffected by Cooldown Manipulation
The following abilities have cooldowns that are unaffected by cooldown manipulation for several reasons:
 * The ability may use a custom cooldown system, which is not covered by default cooldown manipulation.
 * The ability may use a cooldown for other purposes, for example, to indicate a delay before taking effect, like the effect delay of invisibility.

Charges
Some abilities use the charge mechanic, instead of cooldowns. These abilities have a set number of charges on them, which replenish over time. Instead of going on cooldown, these abilities use up one charge per cast. This means when having multiple charges, they can be cast quickly in succession, but cannot be used when having no charges left. Each charge takes a certain time to replenish. Multiple charges of a spell do not replenish at the same time, they recharge one after another.

Charge-based abilities will appear to be on cooldown when using the last charge. This "cooldown" however is only to visualise when the next charge is going to be ready again.

The replenish time of charges can be affected by the cooldown reductions of, , and talents, and can all be replenished with , and are also affected by and. Other sources of cooldown manipulation cannot grant charges back or affect the recharge times.

An ability's current charges and recharge time are indicated by a number at the bottom left corner of the ability icon, surrounded by a green circle that fills up while recharging a charge.

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