'Dune: Prophecy' episode 1: Mother Raquella's vision, explained

HBO's Dune: Prophecy is already making good on its name, delivering some ominous prophetic visions in its first episode.

The first vision comes courtesy of Mother Superior Raquella (Cathy Tyson), the founder of the Sisterhood that will one day come to be known as the Bene Gesserit. On her deathbed, she foresees a terrible future, with an apocalyptic judgment known as Tiran-Arafel coming for the Sisterhood. Much of what she sees in her vision already comes to pass in episode 1, but some images are more symbolic or have yet to happen.