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In page Slayer (Buffy the Vampire Slayer):

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All Slayers through the ages share a psychic link, manifested in dreams.[1] A Slayer will frequently dream of herself as a Slayer in another time and place. These dreams are usually vague, but can also be prophetic.[2] Dreams exist in their own mystic plane or "dreamscape" where for a Slayer, precognitive sense and the inherited memories of other Slayers can manifest themselves.[3] Also, Slayers have been shown to appear in each other's dreams, and Buffy and Faith shared several dreams while Faith was in a coma. Faith provided the first cryptic reference to Dawn Summers' arrival.[4]