Assertion: unbreakable vow | /r/HasProperty | introduced in half-blood prince
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text: The Unbreakable Vow was first introduced in Half-Blood Prince, in which Snape made a promise to Narcissa Malfoy to protect Draco, with Bellatrix as the "Bonder", as her son attempted to fulfil the Dark Lord's task, and for Snape to fulfil the task if Draco fails.