Yiazmat: how difficult is he???

[Vaan1980]

I wiped the floor with gilgamesh both times at lvl 55-60... Yeah disma was a pain in the backside.. I just fled from it and going and leveling up some more... Yiazmat on the other hand I was at lvl 85 and he took me out in about 5 minutes... I had all the buffs i could think of put on my characters and he still did it... Does Yiazmat gain health if you leave the colosseum and heal up and resurrect deaders and then go back in or only if you stay in the area with him? Does anyone think that I should have one physical attacker equiped with the bubble belt/masamune or go with genji gloves/masamune combo? Because I've got 2 masamune's, the tournesol, the excaliber, zodiac spear and 1 bow.