這是三部曲的最后一部，故事圍繞著將自己奉獻給撒旦的妓女展開。這部影片的內容是極端而黑暗的，令人作嘔的情節屢屢出現，充斥著暴力，性，裸體，體液！一群女孩子和一個男人摳喉嚨催吐，然后吃掉嘔吐物，再吐出來……

　　歐文（賈斯蒂斯·史密斯 Justice Smith 飾）和麥迪（布里蓋特·倫迪·佩恩 Brigette Lundy-Paine 飾）因一檔深夜超自然節目而結緣，然而這檔節目卻神秘地被取消了，在暗淡的電視燈光下，他們對現實的看法開始變得模糊不清。

　　In the year 2961, the time is after humanity and nature has recovered the land. A hunter named Cygnus is called to rise above his duty. He provides for Last Arc, a once nomadic band of survivors in need of food and water that is now growing scarce. The answer must be found before a group of outlandish Heretics descend upon them. Cygnus must voyage across the treacherous landscape to defend his people. Sent by Nova, the matriarch of the band, she acts based on her vision for Cygnus to find a seed of hope. The future of Last Arc is for him to discover, Cygnus ventures into a hostile landscape in search of an answer for his people. On this journey of encountering many traps and dangers, Cygnus discovers what has been hunting him is his identity.

　　A family whose daughter is seemingly possessed; their prayers seem to make matters worse. What sin did they commit?