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Seen it with multiple different talents on Grail Knight and on other classes in same party.

No cooldown reduction actually happens.

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over 4 years ago - /u/Fatshark_Calavera - Direct link

Originally posted by [deleted]

The way it's worded "10% cooldown regen" leads me to believe it is not a 10% cooldown reduction like you can get on your gear but instead makes your bar tick 10% faster.

That's right! It works the same way as concentration potions.

Cooldown regen is the rate at which your career skill recharges.

For example with +10% cooldown regen you'll get your ult x1.1 times as fast.

To translate this into cooldown reduction you can use the following formula:

reduction = regen / (1 + regen)

So 10% cooldown regen translates into 0.1 / 1.1 ≈ 9.1% cooldown reduction.

I hope this helps clear things up!