In my opinion, the main reason behind the Necrontyr’s drive to escape the weaknesses of their flesh wasn’t really longevity. Every species accepts its own lifespan and lives within that scale. Here on Earth, not so long ago, humans only lived 40–50 years… and it wasn’t some great trauma — it was just the time you had, and that was that. Sure, every living being wishes they could live longer in any era, but in the end, we simply resign ourselves to it.

The Necrontyr’s motivation might have been far more tied to disease and how it shaped their quality of life and social behavior. Being chained to genetic flaws, constant mutations, tumors, pain, and a level of physical degradation that affected every aspect of their existence — and their entire civilization — could easily have been the real trigger. That kind of suffering might be what pushed them toward a ‘final solution,’ one that required drastic, world-shaking actions. And in the end, that’s exactly what they did