Unknown person referenced in a note found tucked into the violin discovered in Chapter 2.
In Chapter 6, it was revealed that this note was written in Dora’s hand.
In Chapter 13, Dora did a psychometric reading on the violin, and believed that the ensuing vision featured this man playing a magical violin to protect himself and others from a supernatural event taking place in a “meeting hall” of some sort in an unfamiliar city on an unknown planet.
In Chapter 160, Pandora confirmed that even after the recovery of her full memories at the Mad Poet’s Oasis, she still had no memory or knowledge of who Erich was.
First Reference: Chapter 2
Other Notable References: Chapter 6, Chapter 13, Chapter 61, Chapter 62, Chapter 160