Cult (2007)

While studying the differences between religion and cult in college, Mindy, the best student in the class, convinces her schoolmates Cassandra, Bailey, Alex, and Morgan to research the massacre of worshipers of Kwan Yin by their leader Owen Quinlin 20 years before in California. Quinlin had found an ancient amulet in Southern China that would give an enormous power to him after the sacrifice of human souls, but one woman resists and he is destroyed. However, after the death of Morgan, who apparently committed suicide, the students discover that Quinlin has returned and is chasing their souls with his amulet.