The way regas gain their powers in the manga is one of those beautiful mash-ups of science, myth, and personal cost that stuck with me. In the story, power comes from contact with relics — small crystalline cores dug up from beneath ruined cities. These 'regas cores' are living artifacts: at first a mineral, then a
seed for something symbiotic. When someone holds a core, it bonds to their nervous system and begins to rewrite signals, unlocking abilities that reflect the holder's
deepest impulses. That explains why two people can touch cores and manifest wildly different effects; the core amplifies temperament as much as physiology.
The process isn't painless. There’s a ritualized phase described as 'resonance' where the core learns the person's neural map, then a violent rewiring where memory fragments can surface or be suppressed. The manga shows some characters gaining graceful, subtle powers and others warped into monstrous, unstable forms—depending on trauma, willpower, and how well they integrate the core. There are also hints of an older explanation: the cores are leftovers from a civilization that engineered life through emotion-driven tech, so the regas phenomenon is both biological and cultural.
I love how the author balances spectacle with consequences. The powers feel earned and personal, never just flashy plot devices, and the losses and moral choices that follow make the whole thing resonate for me.