Skull and crossbones wax seals (Harry Potter)
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Not much is known about the Memento Mori curse, except that it is completed when the recipient a letter breaks the skull and crossbones seal. Three incidences of the curse have been recorded in history. The initiation of the Memento Mori curse is incredibly complex to perform and there are no known recorded instructions. The Improper Use of Magic Office contains two skull and crossbones seal wax letters and the recipients of the letters are classified.
Memento Mori roughly translates to: remember that you must die..