Pretty good horror/adventure melding pieces of other movies
This is basically a meshing of "The Blair Witch Project" (1999) and "Ogre" (2008), but without the tongue-in-cheekiness of the latter. There's also a little bit of "The Wicker Man" (1973/2006). Like "Blair Witch" the foul-mouthed protagonists become increasingly horrified in the foreboding forest and eventually turn on one another. But the sylvan cinematography is leagues superior due to the spectacular Romanian locations as opposed to the pedestrian film-work of "Blair Witch" in Maryland (which is understandable since the latter is a "found-footage" flick).
The Creature is basically a hybrid of the monsters in "The Relic" (1997) and "Wendigo" (2001), albeit bigger and akin to a large moose, and superior to both.
The second half deviates from the book and people complain about it, but it's superior to the lame black metal cult of the book IMHO and you can't beat one potent sequence that smacks of hell-on-earth. There's also an intriguing element about achieving nigh-immortality at the price of submissive veneration. Despite these positives, the movie's a little uneventful and humdrum, plus it's lacking in the female department.