Well, I was about level 65 with all my characters and wanted to face Yiazmat without leaving the arena once and beating him. It took me about 8-9 hours straight to get him down to 2 bars of HP left.

You can't imagine how pissed off I was when he used White Breath and inflicted Stop on two of my characters and then killed the third with Death Strike. And then he used Cyclone to kill my secondary party, who only had about 4000-5000 HP without Bubble. I didn't use Lure+Reverse by the way.

What a stroke of rotten luck. If it hadn't happened though, I think it might have taken another hour or two.

I then level'd up my party to about level 70 and beat him using about 6 stages and maybe around 7 hours or so. I didn't save though. I'm still keeping my level 65 file though, to hopefully one day beat Yiaz like I had wanted to.