User blog comment:Winchester7314/Possible Recuring S8 Purgatory Monsters/@comment-3481504-20120520040859

Possibilities of what they could and may encounter in Purgatory:

1) Monsters, children and descendants of Eve. take for example, Vampires, Siren, or Dragons. though, Dean, with having Cas, a angel, isn't in danger by them.

2) Eve, seeing as that's directly what happens to creatures of her sort. She could just impair his connection, which would be a problem.

now, those are, with what the show's given us, the only possibilities, as the Alpha Vampire's quote, "Where do my kind [referring to monsters] go"?