Friend was camping Nue with 75 NIN/THF. Decided to go get this since he had no competition for claim.
When I 1st reached the tower, killed 1 placeholder, and spawned next - killed it easily with BRD/WHM (sing 1 Mambo for evading attacks). No drop at first.
After 40mins of killing placeholders, it spawned again. Dropped cesti this time, along with a fang. ^_^
This weapon is hellish and all monks hitting 30 should consider obtaining this. I replaced my Republic Knuckles with this at 30 and found them to be overpowering in all aspects (lower delay + permanent Enaero).