I was using ranger techniques as the little magic I had, including most arrows, had little affect. Basically shoot the magical arrow spray to get multiple hits with one shot then run for it and repeat. Most of the battle was within the cave, not the initial room. Perhaps that triggered the problem? It really was weird; a red flame or blue freeze spell would come from off screen and penetrate the cave walls and either froze me or fried me in the process. I literally did not see him or his dragon. Perhaps my resolution is too low? I had crash issues (actually, the game, except for the sound froze so I could do nothing but <CNTRL> <ALT> <DEL> to close the game) with higher resolution even though I'm using the GOG addition via Galaxy so I went to the default of 800/600 but it seemed I could see a larger area when I used a much higher resolution. my English teacher from elementary school is probably rolling in her grave with that run-on sentance I just did
I did manage to draw off most of his helpers. The ones I didn't get stayed in the initial room anyway - only the dragon rider followed me into the cave.