Well, if you can go into the back area of the Henne mines, then I suggest you go there, and train. Or, go into the very bottom of the Giruvegan Crystasl, you can level up quickly in those two places. You could probably beat the hell wyrm now, but I didn't take any chances. I waited till all my characters were on 99 before I fought him, so just continue training.
Great, I'm moving. Who knows when you'll see me again.