That's unsettling...I've personally been in a group of level 1's that subdued a black dragon at 1st level in a basic game (waaaaay back at the start of the 80's), but could you elaborate on the Balor's defeat - was it luck or manipulating the system?
Yeah, I am kinda of curious myself. It is hard to see how a first level party (unless there is an element missing) broke the 15 DR or the spell resistance, nor how they achieved tactical surprise (true seeing, te) or handled something that could fly, teleport and kill the party with a standard action (Blasphemy is instant death at these levels).