my vow was heard, and that I was reserved for vengeance
The supposition with which this graveyard scene commenced has now
hardened into conviction. But surely Mary Shelley emphasizes her
irony here, that the sign that Victor's vow has been heard is not
some apparition from the dead he would avenge but rather the laugh
of the Creature. It is, then, specifically the Creature who
reserves Victor's remaining months for vengeance.