Unholy

Unholy
A Unholy weapon is imbued with unholy power. This power makes the weapon evil-aligned. Good characters wielding this weapon suffer a negative level. The weapon deals an extra 2d6 points of damage against all targets of Good alignment.

ie.
 * Lawful Good
 * Neutral Good
 * Chaotic Good

See the list of weapon enhancements to find more about the various other aligment effects.