For me it was fail and suck. But the dm told me today that it was actually two monsters he added to the mix - Void something or other - that caused disad on saves, no save, then hit with a con save to avoid paralyzation. Sucked. On top of that, the fight wasn't particularly interesting/challenging since the party has 5 full casters. I just didn't do much aside from an Assassin crit in the first round.