Report All Time Hardest Boss in Community Posted March 11, 2004 Sephiroth from Kingdom Hearts? Please. It's called superglide. Superglide over to him as soon as he teleports to do Sin Harvest, hit him, and he won't do it. Once you get it down, kinda easy, IMO. Hardest boss as of late? Ozma from FFIX was a pain. But hardest boss of all time? I dunno. Never really got to the hard bosses (Tyson, Death, etc.) from old games.