Yes. I still haven’t managed to kill him. I even went back to Ring Man to see if I had any rings that might help me. I have a Power one, which increases my attack strength, but also weakens my defence. That’d be fine, since I can put it on just before I attack the dragon, then take it off in case I get hit.
That was the plan, anyway. In reality, I lost all bar one heart before I even got to the dragon form of Onox, and died after smacking it three times. Bah.