So, _Antrum_ is a found-footage horror movie. Think _The Blair Witch Project_, only Satanic.
There are really two layers to the film: 1. The documentary intro/outro, that prime you for what you are going to watch. 2. The movie proper. The first layer does a great job of setting an eerie tone, while the movie itself feels like a weird art film from the 1970s. Though I think the documentary pieces do a great job of filling in the blanks, I am curious to know what this would have been like as simply _Antrum_, and not found footage.
Speaking of, let's talk about the movie itself. It's very simple: a young boy's dog dies. His big sister takes his into the woods, where they are going to dig a hole to Hell, in order to rescue the soul of his dog. They happen upon two homicidal maniacs. The end.
By itself, that sounds boring, however the movie does a great job of maintaining tension - mostly with music and creepy visuals.
The aforementioned _Blair Witch Project_ is an easy comparison, although, I'd relate this more to _Yellow Brick Road_.
If you can wrap your head around Satanic, arthouse, cosmic horror, you'll have a good idea of what to expect.
Overall, I thought this was quite good. Truly unique. Very simple, yet effective.

The movie that kills

This mockumentary was an interesting ride. The build up to the movie plays on the viewer's mind for something to be surreal and satanic.

Once you get to the movie, it is the total opposite but still it keeps your attention. At least that what's the film suppose to do, it might not be the case for many who would find it boring or feel rather cheated about it.

The movie overall takes you on a journey of a cursed film that can only be cursed to someone who believe it to be. What happens in the movie is only a mask of what is going on - The journey to hell. That said, Antrum is a movie that gives you some sense of supernatural and satanic ritual happening in the film between its visual and audio manipulation.

It is worth seeing for yourself if this movie is truly cursed. Personally, it was something like Everything Is Terrible! Presents: The Great Satan (2017), whether you like it or not...you'll be talking about it regardless.