I'm looking for a movie, not sure what year but probably early to late 2000's? Probably an American film.
My memory is vague but I think it was about humans fighting a monster, about human sized maybe a little smaller, that came through a gateway to hell/another dimension. I think it took place in modern day America?
The only thing I can remember clearly was that at the end one of the characters found the doorway and looked through it and the camera pans out to reveal hundreds of those same monsters all racing towards the gateway.
I've been looking for this title for ages and I cannot for the life of me remember anything else from it (I was young when I saw it). Any and all help is appreciated!