Water of Life
The liquid a drowning sandworm excretes, deadly to nearly anyone who drinks it raw.
A sandworm drowning during the ritual that transforms it into fresh pre-spice mass excretes this liquid. In its raw state it kills almost anyone who swallows it. Only a trained Reverend Mother can turn the poison inward and transmute it into a safe, mind-opening catalyst. The Bene Gesserit refined these techniques since their earliest days. The change unlocks the accumulated memories of her female ancestors. Most Sisters who attempt the transformation without proper grounding die trying. Lady Jessica underwent the ritual carrying Alia. Her unborn daughter absorbed the same transformation and woke with ancestral memory before she had even drawn a first breath. Paul Atreides survived a version of this ordeal that no man had ever lived through before. That alone told the Bene Gesserit their breeding program had produced something past anything they had planned for.
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