Ok, I finally beat him. I used the wall rings, the float spell on everyone, and life3 (which i thought wouldn't work through wall but found differently). It was a long fight, but I finally got him. Now I'm off to willow's tower. If he's true to form I expect it will be hard to get to him, but once I reach him he'll be a pushover. Oh, and I've gotten all the other dragons...so I should be able to catch those last two in there somewhere.