Re: On the Willful Killing and Maiming of NPCs
Late to the discussion (as always) but let me recommend this option.
It has several advantages:
1) It lets your players know how tough their opponents and how high the stakes without putting them at risk.
2) It invests the players in the NPCs. It can be very easy for players to view NPCs are simply plot devices (because in truth thats all they are) but if they walk in their shoes for a while, the characters become a bit more real.
3) It doesn't close off any options. You can still have them dead or rescued or mind controlled or whatever your plot requires.
4) And best of all it gives you maximum player fun for GM work You've had to do the work to plot out this event, might as well get your players involved! It can also be a nice change of pace for your players, particularly if it is going to be a tough campaign.