Dawn Summers

Dawn is first introduced as Buffy's little sister at the end of Buffy season five premiere "Buffy vs. Dracula", despite Buffy having been previously established as an only child. Initially, the mystery of Dawn's sudden existence is not acknowledged in the series, with the other characters accepting her as a part of the status quo. Four episodes later Buffy discovers Dawn is in fact a mystical object known as the Key; a group of monks transformed the Key into human form and sent it to the Slayer for protection from the villainous Glory. The memories of Buffy and her associates were altered, along with relevant records, so that they believed her to have always existed as Buffy's sister. When Dawn learns of her origin, she resorts to self-harm and runs away from home, until Buffy assures her they are real sisters no matter what, securing it with a blood oath.

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