3 of us claimed KA the day of the update with a dagger of all things as the JP linkshells all popped off chainspell, etc. We took him down as quickly as we could with a SMN, RDM and NIN. His attacks were super-innacurate and would hit for 60-70. Level 70 blood pacts would hit him for a respectable 650-900. We were taking him down pretty steadily and it seemed like it was going to be a pretty boring fight. We figured we had it in the bag. That is until we got him to about 1%. At this point I hit him with Predator Claws and it hit for 0. I thought it was weird, but not impossible. That's when I noticed that the RDM and NIN were also hitting him for 0. Then BLAM. It hit the NIN twice for about 450-550 each. The RDM popped a Cure 4 and went down in about 2 seconds. Then it ran through the NIN and me. After we wiped, the JP linkshells voked it at about 0%.... and it killed five fresh players in uber gear before they killed it.