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 you have issued the order to use the skill and the cast time of the skill has passed. For instance, Sand King's Epicenter will instantly go on cooldown instantly when you issue the order, since it has no cast time. If you are 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 you have several versions of the same item, all versions will be on cooldown if you use the active skill of one of them. For instance, all Dagons are in the same cooldown group.

If a skill is on cooldown and you level it 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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