[Help] Reverse Trigger?

[Sombreiro]

I see, Mundane Countermeasure seems just about right! It even brings about the matter "How many people know about it?", as it implies a little bit of thought and experimentation. As he is gaseous, and have compulsive cleaning, many rules about not smoking and things like that, once he reveals as a Ghost, it would be pretty simple to sum it up and fight against him.

Thanks a lot! :D