Type: Spell
Description: Causes a vow taken by a witch or wizard to be inviolable; if they should break it, the consequence is death.
Seen/Mentioned: Snape takes an Unbreakable Vow with Narcissa Malfoy at the beginning of Half-Blood Prince, vowing to help Narcissa's son Draco with a task given to him by Voldemort, and to finish the task should Draco prove incapable. Fred and George attempted to force an Unbreakable Vow upon Ron as children. According to Ron, it causes death when the vow is broken.
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| Snape and Narcissa make the Unbreakable Vow |