Mad scientist gains a conscience in the form of a talking hedgehog in the 1880's.
Rules of curses:
One: A curse must be cast in proximity to the cursed. A curse may not be cast from any distance beyond earshot. If the cursed cannot hear the curse, the curse will not take effect. Written curses must be viewed by the cursed personally and understood by them in their own language. Any other person reading the curse out loud to the cursed, other than the speaker themselves, will have no effect.
Two: There can only ever be one curse in place at any one given time. More than one curse may be placed on a cursed throughout a lifetime, but they cannot have more than one curse in play at a single moment. The first and oldest curse must be removed through the curse's conditions before any other curse may be placed.
Three: Each curse must have a condition for removal. It must be within the realm of physical possibility, though high unlikelihood is allowable. However, there must always be a technical possibility for the curse to be able to be removed.