Fey Me Twice
Roughly translated from Sylvan it means the “Wall of the Dead”.
The only information provided on this seems to be what the party heard from the ancient knight Sir Aloysius. His expedition was sent to Ver Veris to explore first and foremost, but he was also sent there for a second purpose, to verify the status of the Murus Animarum.
He quickly explained to the party the Murus Animarum was a boundary that locked the Fey in their own world. This world was referred to as the First World by Sir Aloysius. The boundary having been formed by the sacrifice of many human lives specifically humans from the Sumatron Empire. Pretty much ending the ancient war between the Fey courts and the Sumatron Empire, but also ushering in the end of their empire and them splitting into two new human nations, Engova and Thenton.