After I found the first potion ingrediant, I went back to the Alchemist. He claims that the Shaman told him we were never coming back. Death Knight mentioned something about the Shaman locking us in a cellar. Did I miss something? The Shaman never trapped us anywhere. I don't even know how to get into his cellar. What's going on?

"And still I could feel the serpent gnawing the roots of the sacred tree..."