First form is easy but his second form is a little annoying because of his wings getting in the way. He also seems to be impervious to reliable juggling techniques.
I'm probably not going to record any of the bosses in the Maze of Tribulations other than Gabriel since they're just weak and generic monsters, and I think I'm going to put this game on hold again since I loathe item creation and I'm getting a little bored once again.