quietus \kwy-EE-tuhs\ (noun) - 1 : A final stroke that settles something. 2 : Discharge from life; death. 3 : A release from a duty or debt.
"The irony was, as Lucinda saw it, that her family's curse would provide its own quietus and lead her to the peace she had so desperately sought."
Short for Middle English quietus est (he is quit), a formula of discharge from a debt or other obligation, from Medieval Latin quietus est, from Latin, quietus, past participle of quiescere (to rest), from quies (rest, quiet).