Ancient Ones

"Giant evil gods."

- Marty Mikalski about the Ancient Ones.

The Ancient Ones are a mysterious and terryfying race of gods and major antagonists in the 2012 horror film The Cabin in the Woods.

About the Ancient Ones
What is known about the Ancient Ones is that they once lived on Earth and ruled all of the universe before mankind. They sleep under the earth and require blood from ritual sacrifices to stay sleeping. If even just one ritual is finished, then they will stay sleeping, but if all the rituals fail, they will wake up and destroy humanity and doom the Earth.

This happens at the end of the film when after the Director tries to sacrifice "The Fool" (Marty Mikalski) at the hands of "The Virgin" (Dana Polk) but failed and died at the hands one of the monsters that gotten loosed from their cube-like prisons. Both Dana and Marty were the last 2 people ever to witness the the true form of the Ancient Ones.