Mustard Gas

Mustard Gas is the primary entity in the four VCE rooms of University High School. It is impossible to make all the stench go away, even when all the windows are open. Luckily, 9S3 only goes in one of those stenched rooms once a week.

Overview
Apparently King Leonidas resides here doing experiments with the pure energy of Andrew Corporation. Several people attempt to mask the stench with gas masks, which are just covering their noses with their clothes. Scientific research has shown that is you're made to stay in that room for more than 1 session, you will turn into pure energy. There has yet to be a solution for this stench, but for now people must survive with this horrible stench.