Tekuani, the Guardian
El reino del guardián (original)
Four close friends descend into the depths of a cave, looking for a lost treasure, ignoring that this will wake the fury of the Guardian the devourer, who will eat their souls until they destroy each other.
Starring Philip Willingham, Manuel Uriza, Iván Arana, Iazua Larios
It's a horror and action & adventure movie, and has a rating of 5.5 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Singapore.