People of Fallcrest, I implore you!
Erzoun is the leader of the shadar-kai occupying the Keep on the Shadowfell. Intercepted correspondence reflects that she is attempting the rituals to reopen a portal deep in the catacombs below the keep. The portal leads to an unholy site in the Shadowfell which is dedicated to the demon lord Orcus. The party is attempting to disrupt the ritual. Erzoun apparently reports to someone named Samminel.