Wraith

Story
Be wary of people who behave very oddly in public, they might be possessed by a wraith that's up to no good. There are rare occurrences where a wraith's gaseous true form can increase in volume, they are much stronger and have more tricks in their arsenal. These relentless pranksters are attracted to people with a weakened state of mind and are very, very dangerous.

Role
Possess enemy

Resistant to physical attacks