Craven

(Champions of Ruin, page 17, DnD 3.5)

[General]

Like most sly rogues, you are a dangerous coward. However, your sneak attacks deal more damage than normal.

Prerequisite

Sneak attack class feature, cannot be immune to fear

Benefit

You take a -2 penalty on saving throws against fear effects. However, when making a sneak attack, you deal an extra 1 point of damage per character level.