Once Bitten, Twice Die

 a limited-time questline released on November 6, 2019. It the main questline of Act 3 of the Treehouse of Horror XXX Event, following Prelude to a Powermove.

End
Unlocks Seven Sisters.

End
Unlocks Pumpkin House or gives 12 Donuts.

End
Unlocks Gingerbread House or gives 12 Donuts.

End
Unlocks Martin of the Opera.