Yea I did same last week and they dont drop it (or its a really ***drop rate)... Move south through the yagudos and through the fomors to the point where black mages used to nuke the time extension from above. Right at the back are 2 warriors a sam a bst and an eye I think. I got mine from these 2 warriors. Maybe other fomors drop it around this area (there are PLD RDM around) but Im not sure. I only needed 2 and they both dropped from warriors.
Happy hunting
I got 3 of mine here, 2 from right next to the guablefuuuaouaepe pop. In about 2 hours, a group of 4 of us got 6 scythe? trigs and 5 shields trigs. We weren't really proccing at all.