Originally Posted by
Advnt
Haste and anything that reduces cast time by % stacks up multiplicatively.
Any effect, such as Light's Grace, that gives you a static ammount will give you that ammount. It's set in stone, there's no hidden math.
Light's Grace + 4pc T10 = .8 seconds off -period-
Then all the haste + % cast time effect (wrath of air) come in all at one, multiplied with one another.
Also, why do people always freak out before even waiting for full details to be revealed? How do you know the IC gear will be stacked up with that much haste?