Eviscerator

(Libris Mortis: The Book of the Dead, page 26, DnD 3.5)

[Monster]

The allies of your foes are especially afraid of your critical hits.

Prerequisite

Death Master, Daunting Presence, Improved Critical, CHA 13, undead type, base attack bonus +1

Benefit

Whenever you score a critical hit with a melee attack against a living foe, creatures within 30 feet that are allied to that foe are shaken for 1 minute. This is a mind-affecting, fear effect.