Imagine that you are an Immortal, Omniscient, Omnipotent spiritual being. You have existed through all eternity, and cannot do otherwise. You are Eternally responsible for the existence of everything you can perceive in your Universe. Your every thought and whim materialize instantly, and disappear as soon as you stop. You know the outcome of every action you take before you make a move. Imagine how boring it might become? What price would you pay to be amused by someone other than yourself? What would you be willing to do to solve the problem of perpetual boredom?
For an Immortal Being, mortality might be a coveted and convenient relief from eternal loneliness: no sensation, no surprises, no fun. What if a "Mortality Mechanic" could make your existence more exciting and less boring? Are you interested? After billions of years of testing and experimentation solutions to Immortality have been codified in the Mortality Mechanic's Manual. You are the living proof that their job is done.