Amazing 1h 3min and 37s, big twist, and just downhill from there

Rating: 3/10 (25 February 2018)

I think my title says it all.
It is a marvellous story about some teenagers, going on a vacation in the woods.
It beautifully builds suspense from the opening scene to the bloody twist.
No annoying jump-scares, that are just meant to be jump-scares, to build suspense for no reason, but really great direction with a good story as a basis.
As a horror genre lover, I really enjoyed the twist from, having a great time with friends, to monsters killing everyone in just a stupid quick death way.
There was some blood and I enjoyed it...
I said to myself: "well-done guys, well done..."
And then ****spoiler****
the stoned guy comes back and ruins the movie.
I mean, it just went downhill from there.
OK, there was this amazing "show all monsters that ever existed" scene, and kill everyone in a big blood-bath.
But they just kept explaining the plot. Nothing seemed believable after that.
And the ending... OMG... just doesn't make any sense.
This is their explanation: "Every attempt in every country in the world failed, to give a sacrifice to the almighty old ruler of the world, so you have to kill that boy, so he won't destroy the world"
NO WORDS
In summary: "Could have been a great movie, but just didn't care for the ending".