Hey guys, Aozora here. And I'm here with another theory relating to Melia and Erin's Mother.
From V12 at GDC library. I found out that Erin and Melia are sisters and when they hugged a yellow light appeared and a voice appeared saying
"My lovely children, how i adore you. No matter what, remember this feeling. Through your sadness, my warmth will bring you hope. Remember me , Remember me. Don't forget" And Melia and Erin both said " It's was out Mother!" in an orange coloured font. So who is there mother? A being or an observer like Crescent?