Vile Martial Strike

(Elder Evils, page 14, DnD 3.5)

[Vile]

You can focus evil power into your weapon blows.

Prerequisite

Weapon Focus (with the specified weapon), CHA 15

Benefit

Each time you deal damage with a specific kind of weapon, you deal an extra 1 point of vile damage.

Special

You can take this feat more than once, selecting a different weapon each time.