Limb regeneration.
Or rather, the study of regeneration itself was a field that humans back in Tesseris—particularly Espers—had been extremely invested in.
While some were awakened with the ability to heal, they couldn't possibly heal everyone, not when injuries had become part of daily life.
In Luca's opinion, that obsession came from a number of things: the rising casualties from dungeon clearing and dungeon breaks, the inability to recover severed limbs from monsters, the failure of vessel-related experiments, and the complications that came with limb reattachment.
Yes, reattachments had come a long way—if the research he'd read was accurate. But that was assuming the limb could even be recovered.
And that was easier said than done, since monsters rarely cared to give things back. And if they did, would it even be in a recognizable condition?
Probably not.
Still, if researchers had managed to create something like Specimen 401, how could they not make new limbs?
