Type: Epic
Source: Epic Level Handbook
You can instantly slay your favored enemies with a single strike.
Prerequisite: Bane of Enemies, Survival 30 ranks, five or more favored enemies (as ranger class feature)
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.