Monstrous Mondays: Wind Wraith

Interestingly enough this monster came up while playing Pokémon GO with my wife and kids at Gen Con this past summer.  Also based on some other ideas I have had over the years.

Wind Wraith
Hit Die: 5
AC: 1 [18]
Attack: 1 touch (1d6 + con drain)
Movement: - (Fly 24)
Save: 12
Alignment: Chaotic
Challenge Level/XP 9/1,100
Special: drain 1 point of Constitution with hit, magic or silver weapon to hit, ignores non-magical AC.

Wind wraiths are the spirits of mortals that die in one of the elemental planes and become hopelessly lost and can't move over to the other side.  They return to the Mortal Plane to haunt others and steal their lifeforce (as represented by constitution points).
The successful touch of a wind wraith will cause 1d6 points of damage and drain 1 point of Constitution.  A saving throw is allowed to prevent this drain, but the damage is always taken.
More horribly the wind wraith ignores all but magical armor.  The foul creature's clawed hand will pass through the hardiest plate mail as it does through leather or cloth.  All are treated as having an AC of 9.
If the armor is magical then the magical enchantment can be added to the character's AC, but not the armor itself.  So +1 Plate mail would confer an AC of 8 while +3 leather armor would be treated as an AC of 6.
Wind Wraiths appear as they did in life from the torso up. Their lower halves fade into mist and vapor.  They typically haunt areas of strong magic in hopes to find a way to a permanent death.  They are also found in the elemental planes.
They can be turned as Spectres.