Death of Enemies
( Epic Level Handbook, p. 52)[Epic]
You can instantly slay your favored enemies with a single strike.
Prerequisite
Bane of Enemies (EL) , five or more favored enemies (as ranger class feature), Wilderness Lore 30 ranks,
Benefit
Any time you score a critical hit against one of your favored enemies, it must make a Fortitude save (DC 10 + 1/2 your ranger class level + your Wisdom modifier) or die instantly.
Special
Creatures immune to critical hits can't be affected by this feat.