Evil Eye of Galakras - Nerfed or bugged?

[Morbycakes]

DISCLAIMER: YES THIS WAS THIS WAY ON THE PTR

So, I ended up getting the CD Reduction trinket off Galakras today. Having been bugged on the PTR, I figured that Blizzard would have fixed it for live (Or changed to tooltip to reflect any nerf to it). However, as far as I'm aware, Blizzard has never said anything about it and I have never seen a post reporting it bugged prior to this either.

SS's of the issue: http://imgur.com/a/CAY7E

Details: Basically, the tooltip says it should reduce the CD of abilities (The one I am examining currently being Pillar of Frost and the focal point of discussion currently) by 42%. However, it is only reducing it by around 29.5% or so. If the tooltip is correct, then it should reduce Pillar to a 34.8 second CD instead of a 42.3 second CD.

[Ragefreak]

No it's not bugged or nerfed. (yes it was nerfed first but it's not similar to your issue). It's just smart use of wow development team trolling mechanics. I don't see the reason why they did this either.. You're not the first came up with this question and many people will be confused and many more topics will show up everywhere.

It does not say "Details: Basically, the tooltip says it should reduce the CD of abilities (The one I am examining currently being Pillar of Frost and the focal point of discussion currently) by 42%."
it says it reduces your cooldown recovery rate by %42, which brings us to your misscalculation. You cannot %42 of your cooldown.

correct math is 1 / 1,42 = 0.704225352.
1 - 0.704225352 = 29.5774647.

It should reduce your cooldown by %29.5774647.
So your observation was right it's %29.5

[Nyanmaru]

It's just the same calculation that it is with haste. (as displayed by Ragefreak)

Atk Spd / ( 1 + Haste bonus ) = New Atk Spd
Old CD / ( 1 + Recovery Rate Increase ) = New CD

People fell for the same math error when they thought 20% haste would mean 80% of the old attack speed

[SSHA778]

As the two posts above have said, the perceived issue is because of the difference in the wording.

The trinket increases the cooldown recovery rate, whereas you said it decreased the cooldown. The important words have been italicized.

Picture a pool being filled by a hose. When the pool is full, the cooldown is ready. There are two ways to fill the pool faster: increase how much water you're flowing into the pool, or decrease the total volume of the pool. Increasing the cooldown recovery rate is analogous to increasing the flow rate. Decreasing the cooldown would be analogous to reducing the volume of the pool.

Mathematically, to show the difference:

Rate increase by 42%:
( 60 ) / ( 1 * 1.42 ) = 42.25s

Cooldown decrease by 42%:
( 60 * ( 1 - 0.42 ) ) / ( 1 ) = 34.8s
(note that the trinket actually says increase, so this equation contextually doesn't make sense)

Very different operations.

[Deleted]

I get the maths, but the wording still makes me feel like blizz have trolled me with it .

[Shiira]

You just misunderstood what the trinket does, which is a shame, but the information has been available for a long time now.

[Deleted]

This has nothing to do with trolling, it's really needed, otherwise the stats will get more and more worthy the more you have.

(example: if 100% haste would mean 100% lower cast time, everything would be instant and an melee could deal infinte damage in one moment)