theory time: i was thinking of the identity of the entity beneath the city, here's my idea, it is a "good" echo, we know that there is something (or multiple things) on Echo that seems to feed of suffering and trauma, in Arches is implied that there are inumerable echos around the world, but all we saw until now have feed on negative emotions and are generally malicious, but the entity in Schippersburg seems to feed on hope and is benevolent, is possible that both entities share a common origin