Toxic waste

You have been exposed to a chemical compound that alters the chemical mass of your body, for example: You can now change your body to the same consistency of that of a helium balloon. You become Balloon Man! or maybe something not so juvenile, it is up to you, or is it?

The Night

An unknown force only known at The Night leaves bodies for investigators to find, when looking into the deaths all of the bodies belong to people who have been involved with illegal activities. Who is this Night?