I killed off my father's ranger today.
The party had been chipping away at the dragon for a few rounds, and were taking their toll on its hit points, although they were taking a beating in the process.
Unfortunately, a few of them ended up in a nice straight line, with the dragon's action coming up soon... only the ranger left to act. He figured the only course he had was to step up and pray he dropped the dragon in one shot... since the only move that would allow him his swing would also put him in that same straight line, and he was down to 9 hit points...
And he rolled a greatsword critical. Enough damage to drop the dragon all the way down... to two hit points.
The dragon breathed, the ranger fried, the two people he was protecting made their saves and took damage, but survived... and the dragon flew away.
It would have been a lovely dramatic moment if that critical had been two points higher. I'm still wondering if it would have been a better session if I'd simply dropped the dragon's total by two...
-Hyp.