Musif is Wall two of Dros Delnoch.
It means "Despair" in the Elder tongue.
"Where strength has not been great enough to hold Eldibar, how can Musif be held? If we could not hold Eldibar, we cannot hold Musif. Fear will gnaw at our vitals. Many of our friends will have died at Eldibar and once more we will see, in our minds, the laughing faces. We will not want to join them. Musif is the test."