A Dungeons and Dragons spell. Finger of death is a spell wizards and sorcerers can learn and cast as a level 6 spell and druids can cast a level 7 spell. It is cast on one living target, which has to make a fortitude saving throw or die immediately. Targets which make a successful fortitude save take 3d6 points of damage plus 1 point per level of the caster, up to 3d6 + 25. A target with a sufficiently low amount of hit points can die even if a successful fortitude save is made.
I'm having a lucky streak: the most difficult creature I encounter between resting periods always fails its fortitude save when I give it the finger of death :D