The second law of thermodynamics states that the total entropy can never decrease over time for an isolated system. So we won't lose the energy, but in a perfectly entropic system, the energy had lost all potential.
From this, we could say that Matter, Energy, and Investiture is merely different levels of Potential. The Potential added to the system through the use of Investiture is then removed from the system through entropy.
This is a slight change in approach here where instead of creasing energy, the use of Investiture is simply harnessing energy and redirecting it.
We could take a bit further and say that like total energy can't change in the Physical Realm (merely rearrange itself), total Potential can not change change in the closed system that is all three Realms.