Ability Cooldown

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Overview

The Ability Cooldown of an ability is a period of time after being used that the ability cannot be used again. Cooldowns range from a few seconds, as in Lady Geist's Malice, to a few minutes, as Dynamo's Singularity. Ability cooldowns can be reduced by acquiring the Cooldown Reduction stat, which reduces the cooldown by a percentage of base ability time.

Some abilities can acquire multiple charges. In those cases, the ability cooldown represents the time for a charge to become available again after being used.

Stacking

Despite being presented in-game as +X% Cooldown Reduction, different sources of cooldown reduction stack multiplicatively, not additively. With $n$ different sources of cooldown reduction, total cooldown reduction is given by:

$CR_{Total}=1-\prod _{i=1}^{n}(1-CR_{i})$

For example, with 12% Cooldown Reduction from Diviner's Kevlar and 16% Cooldown Reduction from Improved Cooldown, total cooldown reduction is:

$CR_{Total}=1-(1-0.12)\times (1-0.16)\approx 26\%$

Sources of Cooldown Reduction

Gold Urns have a chance to drop a permanent 0.75% Cooldown Reduction buff.

Item	Cost	+X% Cooldown Reduction
Spiritual Overflow	6200	+15%
Leech	6200	+12%
Improved Cooldown	1250	+14%
Diviner's Kevlar	6200	+12%

In addition to the generic cooldown reduction items listed above, Superior Cooldown provides +32% Imbued Ability Cooldown Reduction for a single chosen ability and +24% Non-Imbued Ability Cooldown Reduction for those abilities not chosen.