Fair enough. Yes, I did try fighting him the last time I played. Beat Wiegraf fairly handily. It was a bit tricky since I wasn't aware of X-potions and auto-potion, but I got past him. I then proceeded to get demolished by Belias by the second turn. I only had two characters equipped as dragoons and he and his demons simply managed to deal damage faster than I was able to handle.

Maybe auto-potion alone would be enough to save my butt until he goes down now, but the point of the thread wasn't so much needing help. Given enough time spent leveling my characters I can make them all dragoons and decimate him fairly quickly while spending little time vulnerable to attack. The point was simply that I was curious what other people do as I'm interested in trying some different strategies.