Originally Posted by ArsMoritoria

I was just running through and checking on this thread when I noticed that the above numbers are both incorrect.

600 Mastery rating grants 3.5% additional poison damage and, with a bit of testing, it appears that you gain 1% crit chance per 1260 Agility (1200 Agility on an item + 5% from leather bonus).

Mastery works exactly as it did in Cataclysm (albeit with larger numbers), but they now display the percentages accurate to two decimal places instead of rounding them off to even percentages.