here's a vid on how to obtain it: http://www.youtube.com/watch?v=NrtpBEYH0RM
or if you too lazy to check the vid..
elucidator = Last Attack bonus bonus from 96th floor boss Dark Repulsor = Last Attack Bonus bonus from the 100th floor boss. Coat of midnight = some sort of interrupt mission on the 96th floor labyrinth dungeon
there's also the boot of midnight, it's kirito's pants and boots from the anime I think.. you get it from last attack bonus from the 100th floor boss..
I haven't confirmed it myself though, it's just info that I gather from the net.. I'm still on floor 86th.. anyway, except for the boot of midnight I think the other info is pretty accurate since there's a video guide for it
"Well, It's the Black "Waltz," right? You think there'd be three, right?", ~Zidane Tribal, FF IX~