Death of Enemies

(Epic Level Handbook, page 52, DnD 3.0)

[Epic]

You can instantly slay your favored enemies with a single strike.

Prerequisite

Bane of Enemies, Wilderness Lore 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.