[TOMT][Horror Movie][before 2011]

I remember watching this horror movie about some nuns being killed one by one inside a church/chapel/building. If I remember correctly, the cover of the movie DVD/poster is a green fog/cloud with black background shaped of the number of the nuns that is killed . One scene I particularly remember is, one of the nun died by falling into an empty pool for the height, and another nun died being impaled. If I remember correctly again… I think it is the ghost of the first nun who died is the one that killed the other nun. The movie lighting is really dark with splashes of neon green

[TOMT][Horror Movie][before 2011]