I thought it was quite an easy fight. Although I was in the 80s. Hell Wyrm, Omega MK XII and Yiazmat seem to be endurance battles really, rather than an actual challenging boss battle (I haven't fought Yiazmat yet and its 60,000,000+ HP is very daunting). It only takes about an hour to kill the Hell Wyrm if you're in the 80s in case you're reading this and haven't already done it yet. It just saves time. You all know where the ultimate leveling up spot is right?