Wraith

Appearance
Wraiths are Creatures of Spirit that appear as transparent figures. Unlike most spirits they do not glow and are only slightly transparent meaning it is hard to tell whether a figure is a Wraith or not, a feat made harder still by the fact that any armour they wear appears opaque.

Abilities
Like other Creatures of Spirit, Wraiths do not exist in the real world and so normal weapons pass straight through them. Worse their armour does and as such prevents blows from passing through their body, this coupled with the fact that many appear in armour, means that many do not realise they are fighting a spirit. The only weapon that can kill a wraith is one that is enchanted or has a blade constructed from pure silver. Like other spirits, they can also be killed by holy water and by weapons formed from Æther created by sorcerers and warlocks.

Any armour a Wraith wares, he is bound inside and it may not be removed by either the wraith or an external agent and so, although like most spirits a wraith can pass through solid objects, it is forced by its armour to move just like a physical creature.