'Dune: Prophecy' star was worried she was going to fall off a cliff filming one of her most intense scenes

Attila Szvacsek/HBO

• 'Dune: Prophecy' star Jessica Barden filmed one of her most intense scenes at the edge of a real cliff.
• Barden plays the younger version of Valya Harkonnen, leader of the Sisterhood, on the prequel series.
• In episode three, Barden stood in the freezing rain for hours to film her big scenes.

Jessica Barden may play one of the most inscrutable characters on "Dune: Prophecy," but in real life...