When the contamination first hit Brusthonin, there were folk who barricaded themselves inside the Adma Stronghold in order to survive. Surt asked you to find out if the people inside the stronghold had turned into undead. He told you that the gate was still locked and sent you to find the Elim Neligor who was to help you find a way into the stronghold. Neligor sent you to go see Cayron, a friendly Brohum. He told you that there was a secret passage leading from the Old Nahor Castle right into the Adma Stronghold, and that you'd find the key inside the castle. When you brought the key to Surt, he was pleased at the prospect of infiltrating the stronghold.