User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-70.91.92.65-20150914170753/@comment-24834479-20150914235222

1. When monsters die, they are not given the opportunity to stay on earth, but are taken immediately to purgatory by reapers. However, if a monster's soul should escape purgatory, it would be a "monster ghost".

2. I believe that this blade is exclusively useful against pagan, or maybe just Greek gods.

3. The virus did not spread as it was planned to, and so the remaining victims were put down.

4. She survived.

5. I believe they were created by witches.