'Dune: Prophecy' fixes one of my biggest beefs with 'Dune: Part Two'
Jessica takes the Water of Life in order to replace the Fremen's dying Reverend Mother. However, since she's pregnant, the Water of Life also transforms her unborn daughter Alia Atreides (Anya Taylor-Joy), effectively giving her a Reverend Mother-level of consciousness and power in the womb.