When disaster struck humanity, even the rich found there weren't enough caretakers to tend to the sick and dying. The super-rich solved this problem by creating healthcare robots to fill the need. Business magnate Theseus Phidias, with his army of robotic nurses, was therefore able to survive decades after human civilization had ended. As he aged and decayed, he prolonged his life with prosthetics: first an artificial heart, then limbs, until finally there was nothing of his original body left. His new form, no longer bound by biological restraints, continued to evolve. Theseus grew in size and power, reaching superhuman proportions that were once reserved for the gods alone.
In becoming something more than human, he also became something less than human- leaving Death with no soul to harvest, and the alien with no biology to study. Even the curious crab was unsatisfied, seeing nothing in Theseus's gleaming chassis that resembled the Softshells of folklore.
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10 points to whoever guesses where this ongoing story is set. Hint: The first scene is about 385 miles (625 km) away from this scene.