I saw a lot of bad info about weapon farming, and I never saw it get corrected (though maybe I missed it):
If you have floor 96 access and no runic key, you can warp before the boss dies and have a shot (not 100% drop) at a random weapon, and a shot at a headpiece. If you clear the disc, you have a 100% drop on a random weapon, and 100% drop on a head, and you get the Runic Key. If you enter floor 96 with the runic key, you get a 100% drop on the weapon for the job as the person who's disc you're using, and a shot at a headpiece. If you clear, you also get a 100% head drop. For my group, I found a friend that had 96 + runic key already and we agreed to get each other weapons. Now I just have to get the people in my group their weapons (lucked out and had a correct one drop when I cleared the first time), which I can now do 100% accurately each win, instead of a random shot at a random weapon. You need level 50 in each job that you wanna get a weapon for in order to enter, so keep that in mind when you select a member to be the '2nd run up'.
XI Wiki


