It's an easy drop in Aqueducts. At the entrance, there's an unpartied MNK and SMN. I think we killed 3 MNKs before it dropped. The SMN drops the WHM/SMN subligar.
It's really fun to the fight the MNK. He uses Shackled Fists which is a mini version of Asuran Fists as the Fomor will do a backflip. It hurts though.