ANother World of Darkness - Alpha Network
“This is Ectobar glass. He won’t hear you. It’s shatterproof and soundproof.” – Denis Rafkin
This is specially crafted Glass that stops any kind of Spirit from transitioning through it, as well as making it completely soundproof and shatterproof so the Spirits can be trapped by panels of this. It is expensive and time consuming to craft though, requiring a full week of intensive treatment by three skilled workers to craft a single panel.