Cooldown

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

Mechanics
A skill will be on cooldown if the skill was activated and the cast time of the skill has passed. For instance, Sand King's Epicenter will instantly go on cooldown when the order is issued, since it has no cast time. If the unit is interrupted before the channel time is over, the spell does nothing, and the cooldown and mana is wasted. On the other hand, Sniper's Assassinate has a long cast time, and will not go on cooldown before the cast time is over.

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

Some item powers also have one or more cooldowns for being affected by the item power. For instance, Restore (Mekansm) will not heal a hero who has been affected by Restore in the last 25 sec or by Mend (Guardian Greaves) in the last 43 sec.

If a skill is on cooldown and it is leveled up, the current cooldown will not be affected at all.

Some skills have charges and charge restore time instead of the usual cooldown. For instance, Sniper's Shrapnel has 3 charges and 55 sec restore time of each charge.

Cooldown Reduction

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Cooldown Reset

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