Using the Fang of the Nosferatu to Gain Invulnerability

The dread artifact known as the Fang of the Nosferatu may be used to gain virtual (if temporary) immortality. However, this period of invulnerability and unaging comes with a horrible price: the dagger must be used to murder six victims, one on each of a string of six consecutive nights. Of course, this is an Act of Ultimate Darkness. The effects of the Fang last 13 years. More over, the memories of the victims killed with the blade can cause madness in characters whom are not Chaotic Evil