It took me about 30 ifrit kills for that one. Then Garuda it dropped the feather duster on my third kill. I helped my tank friend farm for ifrit and it took us about 80 kills. The other pally said it was his first ifrit kill and lost the roll. Cane of Crags dropped on my first kill.

It isn't a big upgrade from the ifrit weapon and even then you need a shield with it. If you have ifrit's you are fine for killing Titan to get your relic.