Drops from Cowll Hippogryph, a NM in the new section of Woh Gates. For more info on this NM and how to get there, check out this thread:
http://www.ffxiah.com/forum/topic/44971/adoulin-gates-nm
Next best option for DD BRD when you don't need acc. The enmity is a bit annoying but a small price to pay. From a BRD perspective I wish that +20 MAB could've been a +20Acc! But then again my RUN is happy enough to be getting a new Lunge/Swipe option ;)