feat Vile Martial Strike (Vile)

( Book of Vile Darkness, p. 50)

Source D&D tools

The character can focus evil power into her weapon blows.

Prerequisite: Charisma 15, Weapon Focus with the specified weapon,

Benefit: Each time the character deals damage with a specific kind of weapon, she deals 1 additional point of vile damage.

Special: A character may take this feat more than once, selecting a different weapon each time.