(ACKS) Wisp

A version of the venerable will-o-wisp that fits my setting and desired power level a bit better, and adds some flavor text.

WISP
Lair: Never
Dungeon: Solitary (1)
Wilderness: Solitary (1)
Alignment: Chaotic
Movement: -
Fly: 180' (60')
AC:   7
Hit Dice:  4**
Attacks:  1
Damage: 2d6 energy drain
Save: F4
Morale: 0
TT: None
XP: 190

Wisps are a strange creature which may be from another world. They are dangerous, as they are sentient, cruel, and seek fleshly bodies to inhabit.They appears as small globes of intense light, in a variety of hues. They are so cold that they cause a thick fog to form around them in a 120' radius. Wisps are easily mistaken for lanterns from a distance.  When a wisp slays a humanoid creature of near-human size or less, it enters the body through the ear or nose and takes up a sort of half-life within the corpse. The dead creature is then treated as a wight while the wisp inhabits it. Outside of a humanoid host,wisps can only be struck by magical weapons. Cold damage heals wisps for the same amount of damage they would normally take.