>>546072972
Here. A lifecore carries your biometric data and can revert physical damage to some extent due to that. Renoa shoved hers in (You) so that you wouldn’t die in the Prologue, but since it was a rush job we still suffered some damage due to that. Renoa herself was left without a lifeline.
>>546073141
Chaos will warp or even erase the memory (which is why Rin didn’t have hopes of people remembering her) but a Protos will repel that effect to some extent.