Zardoz

In the future, Earth is ruled by Eternals, an advanced and secret sect of beings who reign over a savage group called Brutals. The Eternals have created a god named Zardoz to intimidate the Brutals, making them believe that killing is their natural state. However, Zed (Sean Connery), a Brutal warrior, challenges that assumption when he enters the Zardoz monument and is captured by an Eternal (Charlotte Rampling). There, he learns the truth about the Eternals and the false god that rules society.