I have an idea for a short story:
When people die and go to limbo, they experience exactly enough time that they change somehow. For some, it's only a week or two, for others, months or even years pass in the void, no matter how little time passes before they are revived (for example, even if Tommy and wilbur were revived immediately after dying, tommy would have still experienced 2 months and Wilbur would have experienced 13 and a half years). This is the compromise between the god of life (XD) and the god of death (mumza) that allows for the book of necromancy to work.
The story itself is told from the perspective of mumza as she tries to keep Ghostbur happy, without realizing that she's keeping him from changing and leaving. It would only be one chapter long, but it would make me cry.