Impossible to complete?
My friend & I have played this game countless times but no matter how hard we tried we could not defeat the final boss Deathbringer, I started to doubt that it was even possible... until a few days ago when we slaughtered him. I'm not quite sure how we pulled it off but here's some advice;
Choose Tyris Flare & save as much magic as possible for the final battle, she's not just good looking she's probably the best character.
Learn to use the side to side slash, it does alot of damage & comes in useful when you're surrounded. Another handy move is the running attack.
Try to not lose lives throughout the game, I know that seems obvious but having spare lives is important to beating Deathbringer as he has an infinite supply of magic that can hit you no matter where you are.
Ignore the skeletons, they're only put there to protect Deathbringer & once you kill him they will dissapear.
Well that's all I can think of at the moment, good luck!