Reminds me of the time my party was playing a downloaded module.. we turned around a corner in the dungeon and ran into a bozar (? I think, I can't remember.. was some undead with a death gaze attack). So we all get to save or die and unsurprisingly one of us fails the save. Death ward seems like the spell to have in this situation, but there's a problem... we didn't know about the death gaze til after it happened. And death ward would only have lasted 9 minutes, on 1 person.