Well, generally you will actually expire a while before you manage to empty your store of energy due to one or more parts of your organism failing with your progressively worsening health, and while this will result in a specter due to your severely weakened soul at the time of death, you won't actually die from complete magical depletion. The details of how you die will differ, but it's safe to say that at least one vital organ will have suffered critical failure. It'd take some very special cirumstances to truly remove all the energy of a body - not counting the Withering, since it is bound to the soul rather than the body and will keep draining even after the body has died - like a sudden immense loss of energy that somehow removes all of your energy at once, leaving only a shred of soul too weak to cling to its body. It's an interesting detail to think about, though, because the body won't actually deteriorate from this beyond obviously being clinically dead and lacking lifeforce; if a new lifeforce was introduced into such a body, similar to how a lich moves its lifeforce to a phylactery, before the consequences of death became irrevocable and it was restored to decent health, the body would actually live on as the host to its new soul without any medical drawbacks aside from those that may come with its new soul itself. One lich could occupy the body of another immediately after this had vacated its own body, for instance, and live in it as comfortably as it would its own body.

And oh yeah, happy Easter. Hottest day in Denmark this year yet; it's really starting to feel like proper summer's-coming-soon spring is here.