|Heroic Action Role-Play|
You need some unusual or exotic substance to survive. This can be a continuous need like the vampires blood-thirst, or you can be something you must keep, such as dirt from your grave or a fetish where your soul is kept. If denied this substance for a full day, you gain the Unliving limitation and suffer Power Loss. If the substance is rare enough that acquiring it is a challenge, you can manage a week between uses.