Dawn (portrayed by #MichelleTrachtenberg) is introduced in Season 5 as Buffy's fourteen-year-old younger sister, sent to Buffy in human form as a disguise for the Key, a dangerous magical artifact sought by a hellgod. Although Dawn's genesis is magical, she functions as a complete and normal teenage girl, and, after her true nature has been revealed, she is accepted and loved as a sister, daughter, and friend. Although Buffy initially tries to shelter Dawn from her work as Slayer, Dawn later becomes a useful member of the Scooby Gang.