OK what I remember from this movie is I believe there's either a giant barn, farmhouse, or just a big house that I believe is kind of in the middle of nowhere maybe?
I just remember these disgusting monsters or maybe there's just one

At the end.. im pretty sure... theres a guy walking away in a black coat hat and briefcase? Its been like 12 years since I've seen this and I'm so unsure about all the details and it just scared the bajeesus out of me so I want to know what it is! Please help much thanks!! :D

Would it be deadly spawn

I'm not sure.. it very well could be so ill check it out more.. and thanks!