This shape is a convenience born from the habit of once having a human body. The touch of a wraith does damage in two ways. First, the chilling effect of the touch inflicts a modest amount of damage, even to creatures immune to cold. Second, such a hit drains its victim's Constitution down making them progressively weaker and therefore easier prey. While the chilling damage can be healed normally, the Constitution loss remains until magically restored.
Wraiths are immune to normal weapons.
An attack with such a weapon merely passes through its body with no effect. Silver weapons cause only half normal damage. Magical weapons inflict their full damage, causing a black vapor to boil away from the body of the wraith. Like most undead, wraiths are immune to sleep, charm, hold, death and cold-based spells, poison, and paralyzation. Shadow Shadows are shadowy, undead creatures that drain strength from their victims with their chilling touch.