What if the Kardashev Scale were applied to individual humans? The amount of energy you can harness and expend determines your quality of life (only in the material realm, and not the actual experienced, cognized life?)
Let’s call this the KH Scale (Kardashev-Human). For instance, Type HI would be someone who can afford to escape the earth’s gravity well. Space tourists, billionaires, such like. Type HII are people who can extend their lives well beyond mortal spans (say, two or three hundred years) and expend the energy needed to do that. Type HIII, people who can live indefinitely, bend laws of physics, so they can harness and actually use galaxies’ worth of energy. They could be dematerialised intelligences or entities who need all that energy to power their vast thought processes. Though what those thoughts might be I cannot conceive.